Dual C 939

The more experience you've had with tape decks, the more you're likely to appreciate the Dual C939's performance and versatility. Apply the most demanding musical tests; sustained piano tones for flutter; extreme highs and lowes for frequency response; soft passages for Signal-to-Noise ratio - and you will hear no diference between the original disc and tape made on the 939. all of which brings to life the 939's impressive specifications for wow and flutter (0,05%), Signal-to-Noise (65 dB) and frequency response (20-17,000 Hz). Now we'd like to take you through the 939's astonishing array of design and operating features.

Auto/reverse playback, bi-directional record. The 939 reverses automatically in play-back - a C-90 will play 90 minutes without interruption. There's continuous play too. Recording is bi-directional. When the tape reaches the end, youu just reverse direction.

With any other deck you either live with unwanted sounds on a tape or erase them abruptly - without hearing what you're doing until it's too late.

With the 939's unique fade/edit control you can fade out those annoyances gradually, smoothly and permanently. And then fade back into the music. While listening. Because it's all done during playback.

Drive system and tapeheads like no other.

Dual's powerful Continuous-Pole /synchronous motor,, two capstans and two drive belts maintain speed accuracy within 0,5% . A C-90 cassette fast-winds in lust over a minute, the time other decks need for a C-60. hard permalloy tapeheads are used for their extended life and superior magnetic linearity. The four-track record/playback head switches electronically when the tape changes direction, it never shifts position. The result; perfect tape alignment in both directions at all times.

LED Record-Level Indicators

Meter needles can't move fast enough to keep up with musical signals. Which is why the 939 uses instantaneous reacting LED record-level indicators. And they lilt to the best viewing angle.

Specifications:

The Dual C939 meets or exceeds the requirement of DIN 45 500 for domestic HiFi equipment. The data given base upon the current DIN reference tapes.

Tape Speed:  4,75 cm/s

Deviation from Correct Speed:  less than ±1%

Wow and Flutter:  weighted RMS :  less than ±0,07%

To DIN for reproduction only :  less than ±0,10%

To DIN for recording/reproduction :  less than ±0,10%

Frequency Response (ref-to DIN tolerances)

Fe Standard Tape :  20 -14,000 Hz

CrO₂ Tape :  20 - 16,000 Hz

FeCr Tape :  20 - 17,000 Hz

Distortion K3 at 333 Hz (ref.to 0 dB VU)

Fe Standard Tape :  less than 1,2 %

CrO₂ Tape :  less than 1,8 %

FeCr Tape :  less than 1,0 %

Signal-to-Noise Ratio (weighted)

With Dolby NR

Fe  Tape : better than 63 dB

CrO₂ Tape : better than 63 dB

FeCr Tape : better than 65 dB

Without Dolby NR

Fe Tape :  better than 53 dB

CrO₂ Tape : better than 56 dB

FeCr Tape :  better than 58 dB

Channell Separation at 1000 Hz

Between Stereo Channels :  better than 30 dB

In Oppositie Direction :  better than 60 dB

Erasure at 1000 Hz

Fe Tape :  better than 70 dB

CrO₂ Tape : better than 65 dB

FeCr Tape :  better than 70 dB

Oscillator (push-pull oscillator):  80 Hz

Inputs ( Sensitivity at 0 dB VU)

Microphone :  0,30 mV/10 k hm

Receiver/Amplifier

DIN Connector :  0,45 mV/4,7 k Ω

RCA Jack :  70 mV/ 82 k Ω

Outputs

Receiver/Amplifier

DIN Connector :  0 -700 mV/1,8 k Ω

RCA Jack :  0 - 700 mV/1,8 k Ω

Headphones :  4 - 2000 k Ω adjustable

Fast Winding:  C-60 less than 60 sec.

Complement:  4 Ics; 49 Transistors; 30 Diodes; 1 Darlington photo cell; 28 LED's

Power Requirements:  100 -125 V / 220 - 240 V, 50/60 Hz

Power Consumption:  approx. 35 VA

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