Dual C 839 RC
Auto Reverse Cassette Deck (1979-81)
While the other three Dual cassette decks in this series outperform competitive models, the 839 RC can be compared only with your own conception of the ideal deck. The 839 continues to add features after all other decks are finished.
For example, automatic reverse. When a C-90 cassette reaches the end of its first side, 45 minutes later, that really is the end for other decks. For the 839 it's only the halfway point. Whether in recording or in playback, the tape automatically reverses and resumes the pre-set desired mode for another 45 minutes. And it can be set to play continuously.
Thanks to its computer-logic solenoid-activated controls, the convenience of the Direct Load and Lock system is extended further. If the tape is nearing the end and the music you're recording has no break, you can remove and replace the cassette in less than two seconds - and the record mode continues automatically. In fact, any operating mode - play or fast wind - resumes automatically when you change a cassette. Another fine touch: any slack in the tape is automatically taken up before the drive begins.
Variable pitch control adds another dimension of versatility. If you'd like to play a live instrument to tape accompaniment, you have an 8 percent tuning range for the tape. (That's a lot easier than tuning a piano.) And if a tape made on another deck sounds too flat or too sharp, the 839 can fix that, too.
For recording a program when you're away from the house, the 839 is designed for operation via an external timer. And to operate the deck while you're in the house, but across the room, there's optional wireless remote control. The infra-red technology and PCM principles used prevent any interference with other electronic devices in the home.
The 839's drive system employs two DC servo motors and dual capstans in a closed-loop drive system. This is one reason why the 839's performance is identical in both directions. Another is that the record/playback head has four gaps and does not change positions when drive reverses; it switches electronically.
Electronic fade/edit, variable headphone level, line/ mic mixing, equalized peak-reading LED record-level indicators, six-way bias/equalization (including metal), switchable overload protection, switchable multiplex filter and two-way memory with automatic play - and Direct Load and Lock, of course - round out the 839's astonishing range of features.
Type: auto reverse, 3-head, single compact cassette deck
Track System: 4-track, 2-channel stereo
Tape Speed: 4.75 cm/s
Heads: 1 x record/playback, 2 x erase
Tape Type: type I, FeCr, Cr02, Metal
Noise Reduction: B
Frequency Response: 30Hz to 20kHz (Metal tape)
Signal to Noise Ratio: 67dB (dolby B)
Wow and Flutter: 0.03%
Input: 40mV (line), 0.25mV (mic)
Output: 0.58V (line)
Dimensions: 440 x 150 x 360mm
Finish: metallic silver/brown
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Reviewed Oct 18th, 2016 by telegraph-hill
I had several Decks over the years and if working, this is a state of the art Tape Deck with a warm and wonderful sound, a bit like Tandberg. Unfortunately there are some technical issues. First of all the deck gets hot. This is due to analog power regulators used those days. It makes sense to put some of those to an external heat sink. The second problem are some of the C-mos IC's. Unfortunately one of it used to regulate the speed. If having issues with wow and flutter first have a look at the mechanics. A new belt is mandatory. Also be advised that the mechanics are quite fragile and need some former experience in mechanics. If you still facing problems with wow and flutter look at IC MC14066 and TCA955 (less likely to go wrong) and clean the Vario speed pot at the front panel. If you need some more help drop a message. Cheers, Oliver