HIGH SCHOOLS • JUNIOR HIGH SCHOOLS • COLLEGES • UNIVERSITIES Plan NOW to participate in Audio Devices $16,000 educational awards 72 awards totaling over $16,000 worth of Sound Recording Equipment and tape or discs will be donated by Audio Devices, Inc. Here's a once-in-a-lifetime opportunity for any high school or college that wishes to expand its recording facilities or to start a new sound recording program. First award, in each of two classifications, will be 52,000 worth of tape or disc re- cording equipment, plus S500 worth of tape and/or discs, plus a bonus of S250 worth of tape or discs for Distributor en- dorsement of entry blank. These and 70 other valuable equipment and tape or disc awards will be donated by Audio Devices, Inc., to the schools which, in the opinion of qualified judges, plan to make the most effective and beneficial use of the record- ing facilities offered. You can select your own recording equipment, as well as the types of Audiotape or Audiodiscs that best meet your requirements. There's nothing to buy — no strings attached. For complete details and official entry blank, see your Audiotape Distributor . . . or write to Audio Devices, Inc., Educa- tional Dept. , 444 Madison Avenue, New York 22, N. Y HERE'S THE BOOK YOUVE BEEN WAITING FOR how fo make good tape recordings THE COMPLETE HANDBOOK OF TAPE RECORDING by C. J. LeBel, Vice President, Audio Devices, Inc. This completely new handbook of tape recording contains up-to-the-minute information of interest and real practical value to every tape recordist. Profusely illustrated with photographs, charts and diagrams prepared especially for this book, it con- tains 150 pages of valuable information on all phases of modern tape recording. The author. Mr. C. J. LeBel, is one of the country's foremost authorities on sound recording. "How to Make Good Tape Recordings" can be read and easily understood from cover to cover by even the most inexperienced of home recordists. Yet it contains such a wealth of practical information that it will be a valuable aid to professional tape recordists as well. Available in deluxe cloth-bound edition at $2.50. or economy paper-bound edition at $1.50. Get a copy from your Audiotape distributor or send check or money order direct to Audio Devices. Inc.. Dept. , 444 Madison Avenue. New York 22, N. Y. C -» "M C u ■r. record Published by AUDIO DEVICES, INC. 444 MADISON AVENUE, N. Y. 22, N. Y. audiofilm cuuiiopW* AUDIO DEVICES, Inc. 444 MADISON AVENUE, NEW YORK 22, N. Y IN HOLLYWOOD: 1006 N. Fairfax Ave. IN CHICAGO: 6571 N. Olmsted Ave. Export Dept.: 13 East 40th St., New York 16, N.Y, Cables "ARLAB" AUDIO RECORD Sept. -Oct., 1956 19 QUICK FACTS ON MAGNETIC TAPE RECORDERS (Additional Information can be obtained by writing to the manufacturer) Manufacturer AMPEX ELECTRIC CORPORATION 934 Charter St., Redwood City, California AMPLIFIER CORPORATION OF AMERICA 398 Broadway New York 13, N. Y. Model and Price A 122 Portable A 112 Portable A-SERIES Player-Recorders STEREOPHONIC A 121 Consolette $495. 00 A 122 Portable $449.50 MONAURAL AIM Consolette $439.50 A 112 Portable $395.00 A621 Amplifier Spkr. (Console) $229.50 A692 Amplifier Spkr. (Portable) $199.50 CONSOLE MUSIC SYSTEMS A423 $1470 A323 $1070 Frequency Response At 7Vj"/sec. 30-15,000 cycles -2 db. 50- 10,000 cycles At 3% "/see. 30-7,500 cycles 2 db 50- 5,000 cycles (as above) Data Two-speed units with half-track heads for dual-track recording and monaural or stereophonic playback (in-line heads) through separate amplifier-speakers. Half-track erase heads. Signal-to-noise, better than 50 db below peak record level at 7J/2"/sec and 40 db at 3%"/sec. Flutter and wow, under 0.25% at 7J/ 2 "/sec, 0.3 at 3 J4 "/sec. Rewind time, less than 90 sec. for 1200 ft. Inputs: high impedance line 0.75V rms for program level; high impedance microphone. Playback output greater than 0.75 rms into high impedance load. Port- able units weigh 3 5 lb. Consolettes in blond or mahog- any finish. Ten watts output with noise 70 db below rated output. Response essentially flat from 65 to 10,000 cycles. Con- trols for volume, equalization, selector for tape, TV, tuner or phono. Model 601 Portable Tape Recorder $545.00 Model S-5290 2-Track Stereophonic Portable $995.00 Model 300-C Console Tape Recorder $2046.00 Model 350-C Console Tape Recorder $1315.00 Other Equipment: VU "Magnemite" Model Speed in/sec. 610-AV l5 /u 610-BV 1% 610-CV 3% 610-TV 7V 2 610-DV 7'/j 610-EV 15 Price $365 315 345 365 385 425 40-15,000 cycles ( ±4 db) at 7 V," sec. (±2 db 40 to 10,000 cycles) (=2 db 50 to 10,000 cycles) 30-15,000 cycles (=2 db) at 15" sec. 40-15,000 cycles ( — 4 db) at 7y 2 "/sec. ( -2 db 40 to 10,000 cycles) 30-15,000 cycles (=2 db) at 15" sec. 30-15,000 cycles ( =4 db) at 7 1/ 2 "/sec. 50-7,500 cycles ( ±2 db) at 3% "/sec. 300- 2,500 cps 100- 3,000 cps 50- 5,000 cps 50- 7,500 cps 50- 7,500 cps 50- 15,000 cps A423 console includes A121 stereophonic recorder, AM- FM radio, 3-speed record player and two amplifier- speaker systems for stereo tape playback. A323 includes A121 stereophonic recorder and amplifier-speaker systems only. Portable, professional-type single-track or dual-track recorder with lYl" tape speed. Takes up to 7" reels. Signal-to-noise, over 55 db. Flutter and wow, below 0.17%. Starting and stopping time, less than 1/5 second. Fast forward and rewind, 90 seconds for 1200 ft. Timing accuracy ± 0.2% for 30 minute recording. Separate record and playback amplifiers. Separate erase, record and playback heads. VU meter, independent level con- trols for microphone and line, phone jack for monitor- ing input or tape while recording. Weight, 28 lb. Model 601 tape transport with two modified 601 elec- tronic chassis. Full-track erase, two-track record and two track playback. Signal-to-noise, over 50 db either channel. Inter-track crosstalk rejection, over 50 db. Professional-type, single-track, dual-speed recorder oper- ating at 15" and 7Vi" P er sec - Signal-to-noise, over 60 db by NAB standards. Instant start and stop. Flutter and wow, less than 0.1% at 15"/sec. Rewind time, 1 min. for 2400-ft. reel. Timing accuracy, ± 0.2%. Push button controls for start, stop and record — may be remotely oper- ated. Separate long-life, plug-in heads for erase, record and playback. Other features as on Model 3 50C below. Also available for portable or rack mounting. Professional-type single or dual-track recorder with tape speeds of V/i" and 15" or 3^4" and V/ z ". Signal-to- noise, 60 db (single track) or 55 db (dual track). Flutter and wow, less than 0.2% at 15"/sec. Instantaneous start- ing. Rewind time, 1 min. for 2400 ft. reel. Timing accu- racy. ± 0.2%. Push-button controls for start, stop, fast forward and rewind. Independent record and playback systems permit monitoring input or tape during recording or playback. Also available for portable or rack mounting. Two and three channel recorders for stereophonic or binaural sound recording and parallel recording. Portable or rack mounting. Information on request. Completely self-contained battery-operated portables with spring motor drive. 610-DV and EV are single track — others, dual track. Winding interval 3 to 30 min., de- pending on tape speed. Motor can be rewound while operating. VU meter for measuring record level, output level, "A" battery and "B" battery. Playback through earphones or external amplifier. PM erase optional at extra cost. High and low level inputs. Output imped- ance, 50,000 ohms. Incoming signal can be monitored by VU meter or earphones. Dimensions, 6J/2" x 9'/^" x 14". Weight, approx. 19 lb. MISCELLANEOUS AUDIOTAPE ITEMS Item Type No. Description List Price 3PB 3" Plastic Reel in Box $.25 EMPTY AUDIOTAPE REELS 4PB 4" Plastic Reel in Box .45 IN INDIVIDUAL BOXES 5PB 5" Plastic Reel in Box .60 7PB 7" Plastic Reel in Box .75 Standard Reels 10RB 10V Aluminum Reel in Box 4.00 ^^ 10FS 10' 2" Fiberglass RETMA in Box 4.00 y^5^2""^f 14RB 14" Aluminum Reel in Box 7.40 mtm 10H NARTB Metal Hub .70 >^SS&- S 5PBR 5PBY Red «n MS Colored 5PBG — r 5 Plastic Reel in Box Green .60 ^2* ~~^ Plastic Reels 5PBB Blue J 7PBR Red 7PBY 7PBG _ > 7" Plastic Reel In Box Green .75 7PBB Blue EMPTY AUDIOTAPE BOXES 3B For 3" Reel .15 4B For 4" Reel .20 ^fcrfr .^^^^~ 5B For 5" Reel .20 ^^Q 7B For 7" Reel .20 103 For IOV2" Reel .75 14B For 14" Reel 1.00 CORRUGATED MAILING BOXES Strong, re-usable containers 5M 7M 10M For 5" Reels For 7" Reels For 1014" Reels .15 .20 .30 RECORDING HEAD CLEANER Superior to carbon tetrachloride 1HC One oz. Bottle with Brush .65 AUDIO SELF-TIMING LEADER TYPE ^^^^T 4flh^^^fe A strong, durable leader tape of ^B- white "Mylar" material with spaced ^t**^>T~"^rTr markings to permit accurate rate ■ J0r timing of leader intervals. 3L 100 ft., V wide, Individually Boxed .55 ADHESIVE REEL LABELS Provide positive identification of your tapes, right on the reel. Sim- ply press to apply, pull off to remove. 30AL Envelope of 30, 2" x 2W labels AUDIO HEAD DEMAGNETIZER 20 Removes all permanent magnetism from recording and reproducing heads in a matter of seconds. AUDIO HEAD ALIGNING TAPE Pre-recorded at 2,000, 10,000 and 15,000 cps (15"/ sec.) with precisely correct head alignment. Individually boxed, with instructions. . . . 200 300 ft. on 5" reel, individually boxed, with instructions . . . 10.00 ■i -*^a?! W how to make GOOD TAPE RECORDINGS This completely new handbook of tape recording contains up-to-the-minute in- 25C Deluxe cloth-bound edition 2.50 formation of interest and real practical value to every tape recordist. Profusely illustrated with photographs, charts and diagrams prepared especially for this book, it contains 150 pages of valu- i able information on all phases of mod- ern tape recording. 15P Paper-bound edition 1.50 Hi AUDIO RECORD Sept.-Oct., 1956 The COMPLETE LINE of professional quality CLUCuOTCU3l£ *"<*/ v- -^ /<»■ n^l TIAOI MAIM Manufacturer Model and Price •• Description Type No.* Length Reel PLASTIC-BASE AUDIOTAPE on I'/j-mil cellulose acetate (in the Red Box) Meets the most exacting requirements of the pro- fessional, educational and home recordist at minimum cost. Known the world over for its matchless performance and consistent uniform quality. Series 51. 151 351 651 1251 255 1H 255 1R J2551FS 505 1H 505 1R COLORED PLASTIC-BASE AUDIOTAPE on l'/j-mil cellulose acetate (in same box as above with label for color) Green and blue colored Audiotape, in con- junction with the standard red-brown tape, provide instant visual identification of recorded selections spliced into a single reel {as shown) — permit fast and easy color cueing and color coding. Eliminate need for identifying leaders between selections. GREEN BLUE 151G 351G 651G 1251G 255 1HG 255 1RG J2551FSG 5051 HG 505 1RG 151B 351 B 651B 1251B 2551HB 2551 RB 12551 FSB 5051HB 5051 RB 150 ft. 300 ft. 600 ft. 1200 ft. 2500 ft. 2500 ft. 2500 ft. 5000 ft. 5000 ft. 150 ft. 300 ft. 600 ft. 1200 ft. 2500 ft. 2500 ft. 2500 ft. 5000 ft. 5000 ft. 3" Plastic 4" Plastic 5" Plastic 7" Plastic NARTB Hub IOV2" Aluminum Reel 10'/2" Fiberglass (RETMA) NARTB Hub 14" Aluminum Reel "LR" LONGER-RECORDING AUDIOTAPE on 1-mil Mylar' polyester film (in the Black and Red Box) 50% more recording time per reel. The strong, super-durable polyester film base assures trouble-free operation even under severe con- ditions of heat and humidity. Series 61. °DuPont Trade Mark 261 961 1861 366 1H 366 1R J3661FS 7261 H 726 1R 225 ft. 900 ft. 1800 ft. 3600 ft. 3600 ft. 3600 ft. 7200 ft. 7200 ft. 3" Plastic 4" Plastic 5" Plastic 7" Plastic NARTB Hub IOV2" Aluminum Reel IOV2" Fiberglass (RETMA) NARTB Hub 14" Aluminum Reel n Self-Mailer 3" Plastic Pkg 5" Plastic 7" Plastic NARTB Hub IOV2" Aluminum Reel IOV2" Fiberglass (RETMA) NARTB Hub 14" Aluminum Reel PLASTIC-BASE "LR" AUDIOTAPE on 1-mil cellulose acetate (in the Blue Box) 50% more recording and playback time on low-cost 1-mil cellulose acetate base, afford- ing maximum economy for applications where high strength is not required. Series 41. 941 1841 3641 H 3641 R 364 1FS 7241 H 724 1R AUDIOTAPE ON l'/j-MIL "MYLAR" (in the Green Box) A premium-quality professional tape that pro- vides the utmost in mechanical strength and immunity to temperature and humidity. Will not dry out or embrittle with age. Series 71. 671 1271 2571 H 2571 R 12571 FS 5071 H 507 1R SUPER-THIN AUDIOTAPE on l/ a -mil "Mylar" (in the Yellow Box) Twice as much recording time per reel as stand- ard plastic-base tape. Suitable for extended- play applications where tape tension is not excessive. Series 31. 1231 2431 900 ft. 1800 ft. 3600 ft. 3600 ft. 3600 ft. 7200 ft. 7200 ft. 600 ft. 1200 ft. 2500 ft. 2500 ft. 2500 ft. 5000 ft. 5000 ft. 1200 ft. 2400 ft. 5" Plastic 7" Plastic NARTB Hub IOV2" Aluminum Reel IOV2" Fiberglass (RETMA) NARTB Hub 14" Aluminum Reel 5" Plastic 7" Plastic NARTB Hub IOV2" Aluminum Reel 10'/2" Fiberglass (RETMA) NARTB Hub 14" Aluminum Reel 5" Plastic 7" Plastic List Price Each $ 0.70 1.35 2.25 3.50 8.50 10.90 10.90 17.00 22.10 70 1.35 2.25 3.50 8.50 10.90 10.90 17.00 22.10 1.00 3.75 6.50 12.50 15.00 15.00 26.00 32.00 3.50 5.50 10.00 12.85 12.85 20.00 26.00 4.25 7.00 12.75 15.15 15.15 30.30 36.30 5.00 9.25 k Type Numbers listed cover red oxide wound on reel with OXIDE IN. For tape wound with Oxide Out, change last digit of Type No. from "1" to "0". E.g. Audictape 1250 covers 1200 ft. reel of plastic base tape wound with Oxide Out. COLORED PLASTIC REELS. Audiotape on 5" and 7" plastic reels can be supplied on colored reels at no increase in price when ordered in lots of 30 reels or more of any one color. To designate color of reel (Red, Yellow, Green or Blue) add letters "RR" and "YR", "GR" or "BR" to Type No. Listed. E.g.— Type 1251YR covers 1200 feet of standard plastic-base tape on Yellow Reel. Type 1251GBR covers 1200 feet of Green plastic-base tape on Blue Reel. ; "FS" in Type No. indicate Fiberglass reel with solid hub and 5/16" center hole. AMPLIFIER CORPORATION OF AMERICA 398 Broadway New York 13, N. Y. (other models available) AMPRO CORPORATION 2835 North Western Ave. Chicago 18, III. For information write to GRAFLEX, INC. 154 Clarissa St. Rochester 8, N. Y. AUDIOMATION LABORATORIES 7230 Clinton Rd. Upper Darby 23, Pa. Model Magnemite" Portables 610-A 610-B 610-C 610-TD 610-SD 610-E 6 10- DM 610-EM Speed in/ sec. I5 /| 4 1% 33/ 4 7'A 15 5 /i4-7y, 1%-15 Price $275 225 255 275 295 335 355 395 Weathertite "Magnemites" (Add $30 to price of Std. Units) "Flyweight Magnemite" 3 10- A 310-B 310-C 310-TD 310-SD 310-E "Secret Recorder" 210-B 210-BC l5 /l. 1 7 /8 3% 7'/2 7Vi 15 1'/. 1 7 '8 3>/4 340 290 320 340 360 400 349 369 "Stereo-Magnemite "Hi-Fi Two Speed" Model 757 $249.95 Model 757T $284.45 CONCERTCASTER Continuous Tape Player Without Pwr. Amp. $835.00 With 10W Pwr. Amp. $905 With 25W Pwr. Amp. $935 Frequency Response 300- 2,500 cps 100- 3,000 cps 50- 5,000 cps 50- 7,500 cps 50- 7,500 cps 50-15,000 cps as above as above 300- 2,500 cps 100- 3,000 cps 50- 5,000 cps 50- 7,500 cps 50- 7,500 cps 50-15,000 cps 100- 3,000 cps 100- 3,000 cps 50- 5,000 cps 50- 2,500 cps 50- 7,500 cps 50-10,000 cps 50-15,000 cps 50- 2,500 cps 50- 7,500 cps 50-10,000 cps 50-15,000 cps 100- 3,000 cps 50- 7,500 cps 50-15,000 cps 40-12,500 cycles at 7'/, "/sec. 40-6,000 cycles at 33/4" sec. 40-8,000 Cycles at 3 3/4 "/see. 40-15,000 Cycles at 7Vj"/sec. Data Completely self-contained, battery-operated portables with spring motor drive. Models 610-SD and -E, one track. Four speed models 610-DM and -EM, one or two track. All others dual track. Winding interval, 3 to 15 min. Motor can be rewound while operating. Indicator signals 30 sec. before motor rewind. Play- back through headphones or external amplifier. Op- tional erase. Dimensions, 11" x 8" x 5" for 610-A and -B; 11" x 10" x 7" for all others. Weight, 12 to 17 lb. All standard "Magnemites" available in weather-tight sealed aluminum cases with tongue and grooved edges and built-in neoprene gasket seals. Will successfully withstand severe environmental conditions. Satin fin- ished case anodized to resist corrosion. Portable, battery-operated electric motor driven re- corders with single tape speed. Models 310-SD and 310E are single track, others dual track. Net weight, only 8 lb. Max. reel size, 5". Rewind time, 2 min. Earphone monitor and playback. No erase. PM erase available as optional feature. Powered by 5 replaceable mercury batteries. Dimensions, 5I/2" x 9" x 12". Hidden in zipper compartment of briefcase, operates anywhere on dry cell batteries. Hidden microphone and concealed start-stop clasp switch. Dual track, single or 2-speed recorder operates on replaceable batteries. Maximum reel size 5". Rewind time, 2 min. Earphone playback. No erase. PM erase available as optional feature. Weight complete, including briefcase, 1 1% lb. Designed to record and play back any messages, musi- cal programs or sounc effects up to 60 min. in length on cartridge-loaded endless loop of std. !4" tape. Automatic erase. Push-button start and stop, switch or relay remote control. Electronic-eye recording level indicator. Microphone and bridging inputs. Out- put impedance, 600 ohms. Output level, +6VU. Headphone monitoring. Standard rack panel mount- ing or custom rack cabinet. Size, 19" x 8J4" x 9]/i" . Weight, 24 lb. Portable, stereophonic battery-operated spring-motor recorder. Mechanically similar to 610 series. Two separate channels for stereophonic recording. Inde- pendent gain for each channel. Can be monitored with binaural headphones while recording. Optional P.M. erase. Playback through earphones or external amplifiers and speakers. Input impedance, ^Megohm. Output impedance, 50,000 ohms. Size, SYz" x 11" x 10". Weight, 17 lb. Portable, dual-track, dual speed recorder with or with- out built-in radio tuner. Includes "Piano Key" con- trols, electronic eye recording level indicator, automatic selection locator, and provision for mixing and moni- toring live and radio-phono inputs. Flutter and wow, less than 0.5%. Fast forward, 72"/sec. Rewind, 120" /sec. Signal-to-noise, 42 db. Power output, 3.2 watts. Built-in 6" x 9" PM speaker. Input receptacles for microphone, radio-phono, or remote control. Weight, 34 lb. Heavy-duty console type tape phonograph for provid- ing up to 8 hours of unattended, background music without repetition. Two speeds. Automatic reversal and shut-off with unmodified tape. Automatic, con- tinuous re-cycling or shut-off controlled by switch on panel. Simple controls, light tape tension. Easy and precise head alignment. Signal-to-noise, better than 50 db at 7l/2"/sec. Hysteresis synchronous capstan motor and two 4-pole torque motors. Max. reel size, 14". .41 DIO RECORD Sept.-Oct., 1956 17 Manufacturer AUDIOMATION LABORATORIES 7230 Clinton Rd. Upper Darby 23, Pa. BELL & HOWELL COMPANY 7100McCormickRd. Chicago 45, III. BELL SOUND SYSTEMS, Inc. Columbus 7, Ohio Model and Price FIDELIVOX Continuous Tape Player With single-ended, unbalanced Preamp. $730.00 With push-pull, balanced Preamp. $755.00 VaryTape System With push-pull line Amp. plus 8 VU, balanced $1,750.00 Bell & Howell Miracle 2000 Model 300-MI Mahogany $299.50 Model 300-BI Blond Oak $314.50 TDC 'Stereotone" Portable $249.50 Model RT-75 Three-Speed Recorder $164.95 Model RT-88 Two-Speed Recorder $139.95 Frequency Response 40-8,000 cycles at 3% "/set. 40-15,000 cycles at 7 '//'/sec. as above 50-10,000 cycles |*2 db) at 7'/ 2 "/sec. 50-6,500 cycles (±3 db) at 3% "/sec. 50-10,000 cycles ( =2 db) at 7Vj"/sec. 50-8,000 cycles (=3 db) at 3 3/ 4 "/sec. 30-12,000 cycles at 7i/j"/sec. 30-7,500 cycles at 3 % "/sec. 50-4,500 cycles at 1 Vb"/soc Data Manufacturer Heavy-duty rack-type tape phonograph for providing up to 8 hours of unattended, background music without repetition. Mounts in 31 J/2" 0I space in standard 19" rack. Mechanical and electrical data similar to Concert- caster model, shown on Page 3. 50-10,000 cycles at 7V s "/sec. Consists of two identical Fidelivox automatic 8-hour tape-handling mechanisms arranged for unlimited varia- tion of program continuity by the automatic inter-mixture of the music content ot any two reels. Automatically stops one mechanism and starts the other whenever 30 seconds or more of silence occurs on the tape being played. Permits up to 16 hours of music without repeti- tion. Cycling fully automatic and infinitely adjustable. Manual turnover dual-track recorder with tape speeds of 7J/2" and 3^4" per second. Four speakers: two 8" wooters on opposite sides of case and two electro- static tweeters behind front grill. Three separate motors with electro-magnetic instant braking. Interlocking push- button controls for stop, forward, rewind, play, speaker and record (with safety lock). Automatic tape shut off. Program indicator with manual reset. Fast forward and rewind, 1200 feet in 40 seconds. Wow and flutter below 0.2% at 7^"/sec. Delivers over 8 watts audio. Signal- to-noise, better than 40 db. Distortion less than 3% at 4 watts. Speaker selector switch. Output jacks for ex- ternal amplifier and speaker. Two neon record level lamps. Illuminated %'olume and tone controls. Prices in- clude controlled reluctance microphone, power cord, radio-phono patch cord and 7" reel. Two speed, manual turnover dual-track recorder. Vertical design with 10 inch extended range speaker. Tape speeds of 7I/2" and 33-4" per second. 7" maximum reel size. Three separate motors with electro-magnetic instant brak- ing. Interlocking push button controls for stop, forward, rewind, play, speaker and record (with safety lock). Automatic tape shut off. Program indicator. Fast forward and rewind, 1200 feet in 40 seconds. Wow and flutter below 0.2% at 7 J/J" per second. Delivers over 8 watts audio. Signal-to-noise, better than 36 db. Distortion, less than 3% at 4 watts. Output jacks for external amplifier and extension speaker. Two neon record level lamps. Illuminated volume and tone controls. May be used as public address system. Prices include controlled reluct- ance microphone, power cord, radio-phono patch cord and 7" reel. Portable dual-track recorder with single-lever speed selec- tor for 71/2", 3J4" ° r 1%" P" second. Pushbutton record- ing switch with safety interlock. Fast forward and rewind. Neon recording level indicator. 6" x 9" oval speaker. Two microphone inputs and one radio-phono input. Out- puts for external speaker and external amplifier. Power output, 3.5 watts. Crystal microphone included. Weight, 3 5 lb. Dual-track recorder with tape speeds of 7 '/J" and 3 ^4" per second. Pushbutton controls for tape speed, record, play, fast forward, rewind and stop. Separate tone and volume controls. Neon recording level indicator. Three- motor operation. Inputs for microphone and radio-phono. Outputs for external loudspeaker and monitor head- phones. Power output, 3.5 watts. Weight, 27 lb. WEBSTER ELECTRIC CO. Racine, Wisconsin Model and Price "Ekotape" Portable Model 260 $225.00 Model 375 $99.95 Model 620 (Special 375) $109.95 "Recordio' Model 750 $99.95 Model 621 (Special 750) $109.95 WILCOX-GAY CORPORATION Charlotte, Michigan The Jet Model CL622 Cartridge Loader $129.95 The Master Model 642 (2 speakers) $149.95 The Deulxe Model 651 (3 speakers) $189.95 The Convertible Model 674 (5 speakers) $229.95 The Imperial Model 686 (6 speakers) $269.95 The Coronet Model 785 (7 speakers, clock radio) $329.95 Tape-Disc Recordio Model 4C-10 $199.95 Frequency Response 40-7,000 cycles at 7i/j"/sec. 40-4,000 cycles at 3% "/sec. 85-7,000 cycles at at % "/sec. 85-8,000 cycles at 7'/j"/sec. 65-9,000 cycles at at 3%"/ sec. 80-8, 50C cycles at 7'/, "/sec. 65-10,000 cycles at 7'/j"/sec. 65-12,500 cycles at 71/1 "/sec. 65-15,000 cycles at 7'/ 2 "/sec. 80-6,000 cycles at 3%"/sec. Data Portable, two-speed, dual-track recorder similar to Model 250 on Page 16 except as follows. Signal-to-noise, 35 db. Neon glow tube recording level indicator. Output jack for external speaker. Power output, 2J/2 watts at 5% distortion. Weight, 29 lb. Portable, single speed, dual-track recorders with "Prest- Omatic" push-button keyboard. Signal-to-noise, 3 5 db. minimum. Wow and flutter: 0.5% at 3J4"/sec, 0.35% at 7'/2"/sec. Neon normal and overload recording level indicators. Record lock button prevents accidental erase. Fast forward and rewind, less than V/a, min. for 1200 ft. Amplifier, 3 watts output. Input for radio-phono-TV. Output for earphone monitoring or external speaker. Includes 4" round speaker and crystal microphone. Weight, 26 lb. "Special" models same as above, but in deluxe tu-tone case. Portable, dual-track recorder with ly^'/sec. tape speed and cartridge tape loading. Signal-to-noise, 3 5 db mini- mum. Wow and flutter, 0.5%. "Magic Eye" recording level indicator. Record lock button. Amplifier, 3 watts output. Output for earphone monitoring or external speaker. Includes 4" x 6" speaker, microphone, and cartridge of pre-recorded tape. Weight 22 lb. Portable, two-speed, dual -track recorders with tape speeds of 75/2" and 3}/2"/sec. ample for voice communication Model S6 Synchronous Magnetic Film Recorder $1,500.00 Model CRM-15 Multi-Channel Communications Recorder (Prices on Request) Tandberg Model 2 (two speed) $249.50 Model 2F (remote controlled) $279.50 Model 3 Hi-Fi (three speed) $349.50 50-15,000 cycles (±1 db) at 15" sec. 45-10,000 cycles (2 db) 16mm and 17.5mm film 200-7,500 cycles (=3 db) at 7Vj"/sec. 200-3,500 cycles (=3 db) at 3%" sec. 50-4,000 cycles (±2 db) at l^s "/sec. 40-7,500 cycles (-2 db) at 3 54 "/sec. 30-15,000 cycles (-2 db) at 7Vi"/tet. Data Manufacturer High fidelity lOJ/^" reel tape recorder for professional use and custom installations. Guaranteed specifications, signal-to-noise, over 50 db, wow and flutter less than 0.2%. Features: One volt cathode follower pre-amplifier output. Monitor amplifier with 2'/2 watt output. Adjust- able 70Kc bias-erase oscillator with indicator. Less than Yl second start and stop. Automatic head demagnetizing. Precision revolution tape counter. Electrical remote with automatic drive roller release. flat to about 6500 cycles at 3 3/ 4 "/sec. All-purpose, single channel voice and signal recorders capable of recording continuously for up to 24 hours and 12 hours respectively. Electronic recording level in' dicator. Signal being recorded may be monitored through external headset. Use special, quick-change reels of 2" wide tape on l'/^-mil "Mylar" base, printed with time in minutes, indicating elapsed recording time or exact time of recorded signal. Tape can be bulk erased for immediate re-use. Inputs for telephone, line, microphone. Outputs: speaker/headset. Dimensions: 17" x 11 J/2" x JJ4) . Weight, approx. 25 lb. Portable, professional-type, single-track recorder with tape speeds of 7 J/2 and 15" (or 3% and IVi') per sec. Signal- to-noise ratio, over 60 db. Separate record and playback heads and amplifiers with independent monitor amplifier and speaker. Synchronous magnetic film equipment for motion picture and TV sound recording. Designed for 24 volt battery operation, 110 volt single phase or 220 volt 3 phase. The equipment is very lightweight and housed in small light- weight cases for easy portability. Signal-to-noise: at least 55 db. Maximum harmonic distortion: 1.5% from full level. Film capacity: 1000 feet. Provides up to 15 simultaneous recording channels on 0.7" wide tape. Recording time, up to 4J/2 hours for 5,000 foot reel. Two units, with automatic sequence con- trol permit continuous, 24-hour recording. Signal-to- noise, at least 40 db. Distortion, not more than 5% total harmonic at *"0" input level. Negligible crosstalk between channels. Push-button control. Fast forward and rewind. Automatic stop. Portable, dual-track recorder and playback unit with extra-heavy flywheel and wow-proof belt drive. Flutter and wow: below 0.1% at V/i /sec, 0.2% at 3%"/sec. and 0.25% at 1^'Vsec. Signal-to-noise: 60 db at 7J/ 2 "/- sec, 50 db at 3%" and l%"/sec. Playback output, 2J/2 watts, low level and high level. Electronic eye recording level indicator. 5" by 7" speaker. Three-speed unit has built-in program counter dial. Weight, 22 lb. — with transport case. 27 lb. Light-weight, dual-track recorder with 3^4" ta P e speed. Handles up to 5" reels, providing up to 1 hour recording time. Wow and flutter, approximately 0.5%. High im- pedance microphone input may also be used for radio input. Extremely simple threading and operation. Neon bulb recording level indicator. Weight, 16 lb. Includes crystal microphone with stand. Built-in speaker. Model and Price EMC RECORDINGS CORP. 806 E. 7th St., St. Paul 6, Minn. (Appearance similar to "Communicator" on Page 6) EMC Stereophonic Portable Playback Unit $199.95 (tentative) ERCONA CORP. 551 Fifth Ave., New York 17, N. Y. FAIRCHILD RECORDING EQUIPMENT CORP. 154th St. and 7th Ave. Whitestone 57, N. Y. FEDERAL MANUFAC- TURING AND ENGINEERING CORP. 199-217 Steuben St. Brooklyn 5, N. Y. FENTON CO. 15 Moore St., New York 4, N. Y. Portable Model 3AN ( 33/ 4 -7Vj ips) $379.50 Model 3A/NH (7i/ 2 -15ips) $425.00 Custom Installation Model 66 N {3%-7i/j ips) $399.50 Model 66 H (7'/,-15 ips) $425.00 Ferrograph Hi-Fi Recorder Tape Deck Frequency Response 40-15,000 cycles ( -3 db) «"» 7'/, "/sec. " (2 heads) $195.00 " (3 heads) $225.00 " (4 heads) $250.00 E.M.I. Battery Portable $395.00 Model L2A (3% ip») Model L2B (7i/ 2 ips) Model L2C (15 ips) Console Model Unit 126 $2,750.00 Console Model "PIC-SYNC" $4,000.00 Control Track Generator Model 41 $125.00 FME Model 47 $159.50 Fen-Tone Motek Tape Deck Model K7 $79.50 50-10,000 cycles (±2 db) at 7'/, "/sec. 40- 1 5,000 cycles (±2 db) at 15 "/sec. 50-7,000 cycles (=2 db) at 15"./sec. 50-5,000 cycles (-2 db) at 7'/ 2 "/sec. 50-2,500 cycles (=2 db) at 3 3 / 4 "/se«. 50-15,000 cycles ( = 1 db) at 15"/sec. 50-15,000 cycles ( = 1 db) at 15"/sec. 50-12,000 cycles at 7V, "/sec. 50-7,000 cycles at 3y« "/sec. 50-12,000 cycles at 7i/,"/sec. 50-7,000 cycles at 3 3/4 "/sec. Data This stereophonic playback unit reproduces half track, full track, stereo colinear (in-line) and stereo staggered tapes. Wow and flutter: less than 0.25%. Signal to noise ratio at least 5 5 db when measured according to NARTB specs. One Maico Dynamu 8040 "Ultralinear" upper track head. One Maico Dynamu Stereo colinear (in- line) head. (Gaps are less than .00015"). Two three- stage pre-amplifiers plus cathode follower output. One power amplifier. One 5" round 3.05 oz. special low- frequency, low resonance speaker. One 4" round "tweeter" with 1200 cps crossover network. Accom- modates 7" reels. Dual-speed, dual-track recorders for portable or custom installation, manufactured by British Ferrograph Re- corder Co., Ltd. of London. Signal to noise ratio, better than 50 db, 200-12,000 cps; 45 db unweighted (includ- ing hum). Wow and flutter, less than 0.2% at iy 2 "/sec. Longterm speed stability, better than 0.5%. Erase and bias frequency, 53,000 cps. Two inputs, for 1 megohm and 0.1 megohm respectively. Output arrangements: 15 ohm elliptical speaker: jacks for extension speakers — 0.75 volts at 0.1 megohm for external amplifier. Output power, 2J/2 watts into 15 ohms. Weights: Portable, 49% lb; Custom, 45 lb; Tape Deck, 18 lb. Battery-operated recorder manufactured by Electrical (j Musical Industries, Ltd., of England. Accommodates 5" reels and requires no external power source. Signal-to- noise, better than 45 db unweighted, when replayed on high quality studio equipment. Wow, less than 0.2% at 15"/sec, 0.25% at V/i "/sec. and 0.3% at 3%"/sec. Separate recording and playback heads and amplifiers for monitoring and instantaneous playback. VU meter for recording level. Manually operated geared rewind device to conserve battery life. Operates with cover closed. Weight. 14J/2 lb. complete. Professional type, single-track recorder with 15" tape speed (7I/2" and 30" models available). Total noise and distortion -64 db (ref. 2 J/2% dist.). Adjustable bias. Speed tolerance, 0.1%. Built-in VU meter and circuit checking. Unit-type, plug-in chassis. Automatic stop — instant braking and reversal. Full protection against acci- dental erase. Same as model 126 with the addition of lip synchronous operation. Used with motion picture camera and film pro- jector, synchronous sound tracks are made and played back on Y^" tape, with no interconnecting equipment. Automatic Framing, which assures correct cueing of tape and film, available at additional cost. Other application* include Facsimile recording, multi-track, and telemeter- ing, with frequency response to 100 KG Portable light weight unit for "On Location" picture synchronous sound track recording on '/£" tape. Used with any portable tape recorder with 1 5"/sec. tape speed and frequency response good to 14 KG, a control track is simultaneously applied which later becomes the tape speed control when played back on Pic-Sync recorder. Portable, two-speed, dual track recorder. Signal-to-noise, 43 db. Flutter, less than 0.5%. Fast forward and rewind, 20-to-l ratio. Safety lock prevents accidental erase. In- stant stop lever for editing. Neon recording level indi- cator. Power output, 3 watts. 5x7 elliptical P.M. speaker. Automatic reversible index counter. Input jack for microphone or radio-phono. Output jack for monitor- ing while recording or external hi-fi amplifier. Includes ceramic mike and patch cord with built-in resistance net- work to match recorder. Weight, 27 lb. Three-motor-drive dual-track tape transport mechanism for custom installation. Speed change by conversion pulley. Wow and flutter, less than 0.25%. Adjustment for head azimuth. Positive interlock of all switching and braking mechanisms. Simple push-button control for record, playback, fast forward, rewind and stop. Matched preamplifiers also available. PRO-2, $89.50. TPR-1 $39.90. AUDIO RECORD Sept. -Oct., 1956 13 Manufacturer FENTON CO. 15 Moore St., New York 4, N. Y. INTERNA- TIONAL RADIO AND ELECTRONICS CORPORATION South 17th St. & Mishawaka Rd. Elkhart, Ind. INTERNA- TIONAL SCIENTIFIC INDUSTRIES CORP. 2374 E. Hiway 24, Colorado Springs, Colo. Model and Price Fen-Tone Brenell Mark IV Tape Deck Mark IV (monaural) Mark IV/B (stereo) $96.50 $114.50 BROADCASTER Reel Sizes to 7" $435.00 JAMES INSTRUMENT LABORATORY 9110 South 52nd Court, Oak Lawn, III. KEYSTONE CAMERA COMPANY, INC. Hallet Square, Boston 24, Mass. IMPERIAL Reel Sizes to ioy," $449.00 IMPERIAL LP Reel Sizes to 14" $478.00 »^Ti5 -I "CROWN PRINCE" Professional Series (Rack mounting) Dual Track (lO'/j" reels) $349.50 Full Track (lO'/j" reels) $399.50 Dual Track LP (14" reels) $375.00 Full Track LP (14" reels) $425.00 I.S.I. Tape Recorder for rack or portable mounting $465.00 Audikon Model V-12 For rack or console mtg. $460.00 Carrying Cases $60.00 Frequency Response 30-15,000 cycles (±3 db) at 15"/sec. 50-12,000 cycles (-3 db) at 7'/, "/sec. 50-6,500 cycles (-3 db) at 3% "/sec. 20-20,000 cycles (=2 db) at 15" sec. 20-15,000 cycles (±3 db) at 7'/, "/sec. 40-8,000 cycles (±3 db) at 3% "/sec. (above data for dual-track operation) 20-18,000 cycles (2 db) at 15 "/sec. 20-15,000 cycles ( ~1 db) at 7'/, "/sec. 40-8,000 cycles (±3 db) at 3% "/sec. (dual-track) 30-15,000 cycles ( ±2 db) at 7'/j" and 15"/sec. 30-8,000 cycles (±2 db) at 3 % "/sec. 40-15,000 cycles (=3 db) at 15"/sec. 40-12,000 cycles (±3 db) at 7 '/j "/sec. Data Manufacturer Three-speed tape decks for monaural and stereophonic record/playback, with three-motor drive. All mount up to four heads with individual azimuth adjustment. Cap- stan-sleeve speed change. Dual Yl track operation for up to 7" reels. Two-knob control, fully interlocked. Wow and flutter, less than 0.2%. Fast forward and rewind, 45 sec. for 1200 ft. Monaural deck can be converted to stereo or sound-on-sound recording by installing addi- tional heads. Can be used with PRO-2 amplifier. Portable, 3 -motor, 3 -speed record/playback units avail- able with choice of full or half-track heads (interchange- able, plug-in type). Signal-to-noise; 55 db, 52 db and 44 db at 15", V/l" and 324" tape speeds respectively. Flutter and wow; 0.10%, 0.15% and 0.25% respective- ly. Fast forward and rewind, less than 35 sec. for 1200 ft. Dual-light VU meter for recording level — white light for illumination, red light indicates record and erase. Micro-Sync-Timing, 99.5% playing measured tape. Inputs: two mikes plus radio-phono; two high-level mix, both high impedance. Built-in amplifier with 30-watt peak output, 15 watt peak at less than 1% distortion. Speed reducer (available for all Crown models) gives an additional tape speed of l%"/sec. Rack-panel mtd. 3-speed record/playback unit with 3- motor drive. Includes mike and phono preamplifiers. Cathode follower output for playback through separate amplifier systems. Flutter and wow; 0.12%, 0.18% and 0.25% at 15", 7I/2" and 3%" speeds respectively. Fea- tures otherwise same as "Crown" series. Panel size; 19" by 14" for lO'/V reel models, 19" by 21" for 14" reel models. Portable, two-speed, dual-track recorder with Isimetric Drive and automatic servo control. Single-knob control for play, record, skip and rewind. Includes play and record electronics with cathode follower output, mike and line inputs with mixing controls, electronic-eye level in- dicator, and 3 heads with provision for adding 3 more. Two-speed hysteresis synchronous capstan motor, auto- matic cut-off and tape lifter. Playback noise, 55 db or more below peak output on virgin tape. Overall noise, 50 db or more below peak output. Distortion not over 1% at normal level. Playback, std. NARTB curve. Skip y rewind, less than 60 sec. for 1200 ft. Weight, under 40 lb. in portable case. Two-speed, dual track recorder with \0Yi" reel capacity and 3-motor drive. Hysteresis synchronous direct-drive capstan. Push-button, interlocked relay control. Three heads, monitors from tape while recording. Provision tor 1 extra head. Fast forward and rewind, 40 sec. for 1200 ft. Timing accuracy, ± 3 sec. in 30 min. Signal- to-noise, 52 db. Flutter and wow: below 0.25% at 7J4"/sec., below 0.15% at 15"/sec. Inputs: mixing of mike and hi-level inputs, 50 ohm balanced and 500,000 ohm unbalanced. Cathode follower output for external amplifier. 8 watts at 10 ohms to drive speaker or phones. Weight: mechanism 36 lb., amplifier 10 lb. Keystone Load-O-Matic Tape Recorder Model K-400 $199.50 40-15,000 cycles (±3 db) at 7V,"/sec. Portable two-speed dual-track recorder with automatic tape-cartridge "magazine loading" that eliminates thread- ing. Also accommodates standard 7" reels. Flutter and wow, less than 0.5% at 7l/2"/sec. Electronic eye record- ing level indicator. Pause control for recording or editing. Drum-type index counter. Power output, 8 watts. Three sneakers — one 6x9 "woofer" and two 4" "tweeters". Separate PA input and separate output for external speaker. PA system or monitoring signal while record- ing. Includes pencil-type ceramic microphone, radio patch cord and phono input. RADIO CORPORATION OF AMERICA RCA Victor Division Camden 2, N. J. RANGERTONE INC. 73 Winthrop St., Newark 4, N. J. REVERE CAMERA COMPANY 230 East 21st St., Chicago 16, III. Model and Price Orthophonic Intermatched High-Fidelity Recorder - Reproducer Chassis Type SRT-2 $490.00 "Rangerette" Portable Model A-2 $1,500.00 complete Console Model R-5C with synchronizer (Price on Request) Model T-700D $225.00 Model TR-800D (with radio) $275.00 Model T-700 $235.00 Model TR-800 (with radio) $287.50 Model T-10 $245.00 Model TR-20 (with radio) $297.50 Model T-700 B&M $245.00 Model TR-800 B&M (with radio) $297.50 Model T-10 B&M $255.00 Model TR-20 B&M (with radio) $307.50 Model T-1100 $169.50 Model TR-1200 (with radio) $219.50 Model T-900 $199.50 Model TR-1000 (with radio) $224.50 Model T-100 $169.50 Model TR-200 (with radio) $224.50 Model T-500 $179.50 Model TR-600 (with radio) $234.50 Frequency Response Playback from standard tape, 30-15,000 cycles (=3 db) 40-12,000 cycles ( -2 db) Record and playback 40-12,000 cycles (-3 db) 45-15,000 cycles (=2 db) at 15" sec. 50-8,000 cycles (=2 db) at 7'/, "/sec. 45-15,000 cycles (=2 db) at 15 "/sec. 50-8,000 cycles ( = 2 db) at 7'/ J "/sec. 40-14,500 cycles (=3 db) at 71/2" sec. 40-7,500 cycles (=3 db) at 3%" sec. 80-8,000 cycles (=3 db) at 33/4" sec. 60-15,000 cycles (=3 db) at 7>/ 2 " sec. as above 85-7,000 cycles (3 db) at 3 % "/sec. 75-12,000 cycles (=3 db) at 7'/," sec. 85-7,500 cycles ( -3 db) at 3% "sec. 85-7,500 cycles - 3 db at 3 Va "/see. 100-5,000 cycles (±3 db) at 1 %"/sec. Data Semi-professional type recorder/ reproducer chassis with direct synchronous motor tape drive. Recording speeds of lYl" an d 3%"/sec, by selector switch. Electro dy- namic tape tension and braking. Signal-to-noise, better than 50 db with less than 3% distortion. Flutter and wow, less than 0.2%. Fast forward and rewind, 45 sec. for 1200 ft., with automatic tape lift. VU meter for recording level indication. Transistor record and play- back amplifier with printed wiring. High impedance bridging input and low impedance microphone input. Outputs, 0.6 v into 10,000 ohms or more and high impedance monitoring jack. Can be mounted horizontally or vertically. Dimensions: IOY2" x 19" x 8J/2". Weight, 35 lbs. FOR SYNCHRONOUS SOUND RECORDING Professional-type, single-track, dual-speed recorders, with choice of T>Yi" , lYl '. 15" ° r 30" per second tape speeds. Up to 2 hours recording at 1Yl" P er s e c - on H ree ' Distortion, less than 2% total harmonic. Maximum signal- to-tape noise, 5 5 db. Double-puck, tight-loop tape drive. Peak-to-peak flutter, less than 0.1% at 15"/sec. Rewind speed controllable continuously from to 250"/sec. in both forward and rewind. Meets all N.A.B. adopted standards. Complete monitoring and mixing facilities. VU meter, signal indicator and footage counter calibrated in minutes and seconds. Complete tape editing facilities. Also available with positive "sprocketless" synchroniza- tion for motion picture and TV applications. Weight of Rangerette — 30 lb. Kits added to other professional recorders for Synchronout Sound Recording for $295.00. Portable dual track lecorder available in either single 01 dual speed. Convenient keyboard control, electrical sole- noid operated. Signal to noise ratio over 48 db on dual speed machines and 50 db on single. Distortion less than 0.65% on normal levels. Rewind and fast forward speed, 170 ips. Flutter and wow less than 0.3%. Two neon lamps for accurate level setting. Precision revolution index counter, for instant location of recording. Can be op- erated as a PA system. Provision for electrical remote control'. Table models (as above) in solid blonde oak or solid Honduras mahogany. Special pressure relief port for ex- tended frequency range. Portable dual track recorder available in either single (3J-4 ips.) or dual (3% - 1Yl >P S ) speed. Signal-to-noise ratio over 48 db on either machine. Distortion less than 1% at normal levels. Rewind and fast forward, 170 ips. Flutter less than 0.3%. Single knob control automatically returns to stop when power is turned off. Dual level indi- cator. Revolution index counter. Instant stop button. Two-speed knob can be changed while in any function. Rugged fiberglass case. Two speakers. Can be operated as a PA. Weight, 28 lb. Portable, dual-track recorder available in either V/& or 3J^ ips. tape speed. Signal-to-noise ratio, over 45 db at either speed. Distortion, less than 1.5%. Rewind and rapid forward, single knob control, flutter less than 0.3%. Two level recording indicator. 5" x 7" Alnico V speaker. Weight, 25 lb. 12 AUDIO RECORD Sept.-Oct.. 1956 Manufacturer PRESTO RECORDING CORPORATION P. O. Box 500, Paramus, New Jersey RADIO CORPORATION OF AMERICA RCA Victor Division Camden 2, N. J. Model and Price Model SR-27 Complete with A-920 amplifier $485.00 Model A-920 Amplifier $324.00 Model R-ll Recording Mechanism (in carrying case) $827.00 Chassis Only $775.00 Model SR-11 Recording Console $1,250.00 Model PB-17A Tape Reproducing Mechanism $700.00 Model A-904 Amplifier $146.00 Continuous Tape Reproducing Console $996.00 The Congressional Model 7TR2 $159.95 The Judicial Model 7TR3 $199.95 The Legislator Model 7TRC1 $279.95 "Victrola" Stereotape Players Portable Model 8STP1 $295.95 Consolette Model 8STP2 $350.00 Frequency Response 50-15,000 cycles at 15"/sec. 50-10,000 cycles at 7 V, "/sec. 50-15,000 cycles at 15 "/sec. 50-10,000 cycles at 7y, "/see. 50-8,000 cycles at 3%",sec. 50-8,000 cycles at 3 y 4 "/sec. 90-8,000 cycles at 7'/,"/sec. 70-12,000 cycles at 7 1/i "/sec. 60-12,000 cycles at 7'/, "/set. 70 to 12,000 cycles at 7Vj"/sec. Data Manufacturer Professional type two-speed equipment for portable or stationary use. Tape transport mechanism has true three- motor drive and separate erase, record and reproducing heads. A-920 amplifier consists of microphone preamp, reproduce preamp, power amplifier and power supply. Includes twin speakers for playback. Monitors from input or tape while recording. Input for microphone or high impedance bridging. Output; 10 watts at 15 ohms, line level at 500 ohms. Monitor ouput for headphones. Max. reel size, 8". Professional type portable tape mechanism with three- head assembly: erase — record — reproduce. Brakes and capstan pressure pulley solenoid operated. Dual-speed motor heavy-duty capstan drive unit, with tape reels mounted directly on individual torque motors. Flutter 0.15% at 15"/sec. Signal-to-noise. 55 db. Simplified threading, easy access to heads. Professional console-type unit, consists of R-l 1 mechanism and 901-A amplifier. 900-A amplifier may be substituted if desired. Tape transport panel and amplifier panel are hinged — every component readily accessible. Dual-track reproducing mechanism with 3f^" tape speed and automatic reversal, giving up to 8 hours of continuous music on a 4800-ft. reel. At end of this time, mechanism may be made to recycle or stop. Heavy duty capstan drive unit with individual torque motors for each reel. Signal- to-noise, 55 db. Flutter 0.35% at V/4" speed. Long-playing tape reproducing unit consisting of PB-17A tape transport mechanism and A-904 Amplifier in console cabinet with dust-protective plastic top. Dynamic range, 45 db. Also available with PB-15A mechanism, which is similar to PB-17A except with \0Vi" reel capacity only. Portable, two-speed, dual-track recorders with push- button control. Normal and overload neon recording level indicators. Ceramic microphone with 7-ft. cable fits into storage well. Take up to 7" reels. Rewind time, 2 min. for 1200 ft. Inputs for microphone and radio- phono. Model 7TR2 has 5" x 7" speaker. Model 7TR3 has Panoramic Speaker System — one 6J/2" and two H/i" speakers. Also window counter, voice-music switch, re- mote control unit and provision for plugging in external speaker. Consists of Model 7TR3 recorder chassis mounted in console type wooden cabinet with Panoramic Speaker System — one 8" speaker and two iYl" speakers. Stereophonic tape playback units in portable and consol- ette models. Plays both single-track and dual-track tapes. Two matched cases — one with tape mechanism and left channel speaker system, the other with right channel speaker system. Tape player has in-line (stacked heads), and push-button controls for fast forward, rewind, stop and two play buttons — one for stereo and one for con- ventional tapes. Two-channel amplifier provides 2j/? watt output for each channel. Each Panoramic Speaker System consists of one 6I/7" speaker and two iYl" speakers. Consolette model available in mahogany or light oak finish. MAGNECORD INC. 1101 S. Kilbourn Ave. Chicago 24, III. MAGNETIC RECORDERS COMPANY 7120 Melrose Ave Los Angeles 46, Cal. Model and Price PT6-S5A PT6-S5J Recorder with Case Amplifier with Case $365.00 $260.00 Without Case $340 Without Case $240 Frequency Response 50-15,000 cycles (-2 db) at 15", 'sec. 50-7,500 cycles (±2 db) at 7'/,". sec. Magnecord S36-B Recorder and Preamp. with Case $395 Without Case 370 Magnecord P60 Recorder Amp. with case $765 without case 680 Tape Transport with case $465 without case 415 Magnecord P63 Recorder Amp. with case $839 without case 764 Tape Transport with case $465 without case 415 Magnecord M90 Tape Transport with case $995 without case 935 Amplifier with case $390 without case 360 Recorder Amp. with case $1375 without case 1285 Recorder Amp. and Console Cabinet, $1450 Portable Reporter" Standard Model $199.50 Deluxe Model $237.50 50- 1 5,000 cycles (2 db) at 15 "/sec. 50-10,000 cycles (2 db) at 7y," sec. 40- 1 5,000 cycles (2 db) at 15" sec. 40-12,000 cycles (=2 db) at 7Vj"/see. 50-15,000 cycles (2 db) at 15",'set. 50-10,000 cycles ( " 2 db) at 7t/,",sec. 30-15,000 cycles (±2 db) at 15" sec. 30- 1 5,000 cycles (4 db) at 7y," sec. 80-7,000 cycles Data Portable, two-speed, single-track recorder with speed- change switch and hysteresis synchronous drive motor. Signal-to-noise, 50 db unweighted. Flutter: 0.3% at 15"/sec, 0.4% at 7!/ 2 "/sec. Rewind time, 40 sec. for 1200 ft. with automatic tape lift. Erase and record/play- back heads. VU meter for bias, record and playback level. Monitoring by 5" speaker and phone jack from tape or input. 10 watt power amplifier. Microphone and unbalanced bridging inputs. 4 and 16 ohm power out- puts, 600 ohm line output. Single unit recorder and preamplifier for rack or port- able mounting. Two-speed, single-track, with capstan speed change and hysteresis synchronous motor drive. Signal-to-noise, 50 db unweighted. Flutter, 0.37c. Re- wind time, 40 sec. for 1200 ft. Erase and record/play- back heads. VU meter for record and playback level. Phone jack for monitoring. Microphone and unbalanced bridging inputs. 600 ohm balanced or unbalanced line output. Rack-mounted or portable full-track recorder with IOJ/2" reel capacity. Direct drive hysteresis synchronous motor. Push-button controls, instantaneous start and stop, fail- safe brakes and tape break control. Signal-to-noise, 55 db unweighted. Flutter; 0.2% at 15"/sec, 0.25% at 7l/2"/sec. Rewind time, 100 sec. for 2400 ft. Timing accuracy, ± 3 sec. in 30 min. Separate erase, rceord and playback heads. VU meter for bias, record and playback level. Adjustable bias and high-speed cueing control. Microphone and unbalanced bridging inputs. Phone jack for monitoring from tape or input. 600 ohm unbalanced line output. Tape transport mechanism similar to above, but designed for use with P63-J amplifier instead of P60-C, permitting conversion of existing equipment to new, improved per- formance standards. Signal-to-noise, 50 db unweighted. Microphone input, 50 to 250 ohms balanced or un- balanced. Unbalanced bridge input. Monitoring by 5" speaker and phone jack from tape or input. Amplifier, 600 ohm balanced line output, 4 or 16 ohm, 10 watt speaker output. Portable, professional-type two speed recorder/amplifier units, also available in console cabinet mounting. Elec- trically interlocked push-button controls. Direct-drive hysteresis synchronous motor. Separate erase, record and playback heads — interchangeable assemblies for full track, half-track or instrumentation. Instantaneous start and stop, automatic tape lift. Separate record and plavback amplifiers for simultaneous monitoring from tape. High speed cueing control. Signal-to-noise, 58 db unweighted. Flutter: 0.1% at 15"/sec, 0.15% at 7l/ 2 "/sec. Rewind time. 55 sec. for 2400 ft. VU meter for bias, record and playback level. 50 or 250 ohm balanced or unbalanced microphone input, balanced or unbalanced bridee input. Line output, 600 ohms balanced or unbalanced. Portable, battery-operated recorder with spring motor drive. Power for amplifier furnished by dry batteries. Spring drive lasts for 7 minutes at 7'/2"/sec. tape speed. Can also be adjusted for 3%"/sec. tape speed. Can be rewound while recording. Single control — off, palvback record. Complete with batteries, microphone, head phone (or speaker) and tape. Standard Model includes provision for headphone plavback onlv. Deluxe Model includes out- put amplifier and loudspeaker. Weight. 12 lb. Made in England. 10 AUDIO RECORD Sept. -Oct., 1956 11 Manufacturer MAGNETIC RECORDING INDUSTRIES 11 E. 16th St. New York 3, N. Y. Model and Price Synchrotone Dual Model ML-63 $375 Synchro- Magneticon Dual Model ML-65 $225 (in portable case, $245.50) Synchro-Magneticon Dual Tape-Disc Recorder-Reproducer Model ML-66, $275 (in portable case, $295) MARK SIMPSON MFG. CO. INC. 32-28 49th St., Long Island City 3, N. Y. MOHAWK BUSINESS MACHINES CORP. Brooklyn 33, N.Y. THE PENTRON CORPORATION 777 South Tripp Avenue, Chicago 24, III. Voice-Master Magnetic Disc Recorders Voice-Master Streamliner $195 Voice-Master Challenger 295 Voice-Master Companion 229 Voice-Master Ordertaker 155 "MASCO" Model 500 $168.50 Mohawk "Midgetape" Battery Operated Portable $249.50 [i"~^ j "' ' ' <3 Mohawk Message Repeater Record-Playback Unit $159.50 Playback Unit $79.50 Pentron "Clipper" Model RWN $139.95 Frequency Response Data Manufacturer to 10,000 cycles at 7!/ 2 "/sec. to 7,500 cycles at 3y 4 "/sec. to 8,000 (tape) to 5,000 (disc) 100-5,000 cps 100-5,000 cps 100-7,000 cps 100-4,500 cps 50-12,000 cycles (±3 db) at 7yj "/sec. 50-7,000 cycles (±3 db) at 3% "/sec. 200-5,000 cycles (-5 db) at l%"/st»c. 200-5,500 cycles ( = 1 >/, db) at 3 % "/sec. 50-9,000 cycles at 7i/j"/sec. 50-5,000 cycles at 3% "/sec. Two independent channels, each with independent recording-playback facility; simultaneous recording on channel 1 and playback of channel 2; simultaneous play- back of channel 1 and channel 2; facilities for listening optionally to channel 1 or channel 2 or to both channels; split-a-word control for instantaneous stop and start of tape without slurring. Record safety interlock. Loud- speaker or headphone listening; two speeds (3% and 7J/2 inches per second); single operation of record, listen, fast forward, rewind and stop. Weight: 33 lb. Two separate channels permitting simultaneous recording on channel 1 and playback of channel 2; simultaneous playback of channel 1 and channel 2; 324" per second speed; single control operation for record, listen, fast forward, fast reverse and stop. Fully automatic operation eliminates external record-listen control. Record safety interlock. Weight: 19 lbs. in portable case. Educational language recorder using standard tape and pre-grooved, reusable magnetic discs. Instant stop-start without slurring. Remote control of magnetic disc. Tape speeds 3% or V/ 2 ". Weight: 22 lbs. Fully automatic magnetic disc dictating and transcribing machine, recording on pre-grooved, reusable and foldable magnetic discs. Features include semi-automatic or fully automatic controls, automatic error correction, direct disc indexing, instant stop-start, and syllable controlled back- spacing (from mike or footcontrol). N.° record-listen switch. Weight: 8 or 10 lbs. Semi-automatic dictating-transcribing unit Fully automatic dictating-transcribing unit Fully automatic transcribing unit Telephone recording unit Portable two-speed, dual track recorder with single shift- knob control of all functions. Signal-to-noise, over 45 db. Wow, less than 0.3%. Power output, 5 watts. Includes standby and monitor switch, two neon recording level in- dicators, safety record-lock button, 5" x 7" oval speaker, ceramic microphone and patch cord. Fast forward and rewind, 90 sec. for 1200 ft. Immediate stop from any speed. Inputs for microphone and radio-phono. Outputs for external speaker and external amplifier. Weight, 23 lbs. Portable, dual-track recorder. Self-contained battery power supply. Battery life 45 hours. Battery life indicator light. Cartridge-loaded ('/2 hour to a side.) Rewind, manual, two minutes for v| hour recording. 3 controls: On-Off, Play-Record, and Volume. Wow and flutter, less than 0.7%. Signai-to-noise ratio, 42 db. One microphone input, high impedance (1 mv min.). Output for earphone or ex- ternal amplifier. Tape, %", "Mylar" base. Supplied with microphone, earphone, batteries, and tape. Accessories available. Size: 8'/ 2 " x PA" x V/ 8 ". Weight, 3 lb. Midget, recorder/playback unit with continuous-loop tape cartridges of from 15 to 240 seconds capacity. Repeats message continuously or intermittently by external switch control. No rewinding necessary. Neon bulb recording level indicator. Built-in 5" speaker. Output, 1.2 watts. Plug-in sockets for microphone, external start, external amplifier or speaker. Overall size, 6I/2" x 5J4" x 5 '/J". Weight: 5?4 lb. Portable two speed, dual-track recorder with Monomatic single slide-knob control for tape speed, record, play, fast forward and rewind. Signal-to-noise, 42 db. Flutter, under 0.5% at V/z'/sec. Power output, 4 watts. Neon bulb recording level indicator. Inputs for microphone and radio-phono. Outputs for auxiliary speaker and amplifier. Microphone included. Also available with single track heads. Weight, 23 lb. THE PENTRON CORPORATION 777 South Tripp Avenue, Chicago 24, III. Model and Price Pentron "Pacemaker" Model T-90 $199.95 Pentron "Emperor" Model HFW-500 $299.95 Pentron "Encore" Tape Player Model TP-3 $149.95 Pentron Stereophonic Tape Player Model PS-1 $249.95 ■mSm o PREMIER ELECTRONIC LABORATORIES 382 Lafayette St. New York 3, N. Y. Pentron "Dynacord" Model DM-2 Tape Mechanism $395.00 Model DS-10 Preamplifier $130.00 Tape Mechanism Case, $30.00 Amplifier Case, $25.00 "Tapesonie" Model 70-C $398.75 Frequency Response 50-10,500 cycles at 7'/, "/sec. 50-5,000 cycles at 3% "/sec. 40-12,000 cycles at 7yj"/sec. 40-6,000 cycles at 3% "/'sec. 50-8,000 cycles at 71/, "/sec. 50-5,000 cycles at 3% "/sec. (as above) 40-15,000 cycles ( =2 db) a; 15" sec. 40-10,000 cycles ( -2 db) at 71/2" sec. 30-18,000 cycles (=3 db) at 15" sec. 30-15,000 cycles (=3 db) at 7'/," sec. 30-7,500 cycles (=3 db) at 3% "/sec. Data Portable dual-track, two speed recorder with Unimagic single-lever control for play, record, fast forward and rewind. One knob speed change. Signal-to-noise, 50 db. Flutter, less than 0.3% at 7J/£ per sec. Fast forward and rewind, 70 seconds for 1200" ft. Power output 5 watts. Electronic eye recording level indicator. Two Alnico V speakers, 1 woofer and 1 tweeter. Automatic index counter. Inputs for microphone and radio-phono. Outputs for external speaker or amplifier. Weight, 27 lb. Mechanically similar to Model T-90. Has illuminated VU meter and three-speaker sound system with two 6" woof- ers and separate 4" "roving" tweeter. LC crossover net- work at 1000 cycles. Power output, 10 watts push-pull. Weight, 33 lb. Portable two-speed, dual -track tape playback unit with "Unimagic" single-lever control for play, fast forward and rewind. Plays any standard 7J/£"/sec. and 324"/sec. recorded tape. Complete with amplifier and speaker. Single-track units also available ($154.95). Consists of two-speed tape deck and two preamplifiers in consolette wood cabinet. Plays stacked stereo, stag- gered stereo, full track or half-track tapes at 7J/^" or J4"/sec. Preamps equalized to NARTB standards. Sepa- rate volume, tone and master gain controls. "Unimagic" single lever control for play, fast forward and rewind. Instantaneous automatic braking. Shipping weight, 33 lb. Professional type, dual-speed recorder for rack or portable mounting. Standard speed, 71/2 " and 15"/sec. Also avail- able for 324" ar) d 7I/2" speeds. Signal-to-noise, over 55 db Flutter and wow, under 0.2% at 15"/sec. Starting and stopping time, 0.1 second at 15"/sec. Playback timing accuracy, ± 0.2%. Rewind time, less than 60 sec. for 2400 ft. reel. Three separate heads. High inertia, direct capstan drive. Dynamic braking. Push-button controls with automatic cycling for record, fast traverse, play and stop. Erase interlock, automatic stop and instantaneous stop bar. Monitors from input or from tape while re- cording. Portable professional type three-speed recorder. Three motors, including hysteresis synchronous drive motor. 4J/2" VU meter. Push button operation using seven re- lays and one solenoid. Three separate heads, permitting instantaneous monitoring from tape while recording. A.B. switch permits comparison between original and recorded program. Flutter and wow 0.1%. Mixing chan- nels for mike, radio or phono inputs. Full protection against accidental erase. Bass and treble controls with flat response setting. Fast forward and rewind, less than one minute for 2400 ft. Electro dynamic brake action and tape tension, never requires adjustment. D.C. on preamp heaters. Push-pull 12 watts audio output.