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
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