R-57 Dual Preamp/VCA
The R-57 apparently replaces the R-51 VCA. However, if the R-51 could be compared to a rose-scented roll of premium extra-soft serviettes, by comparison the R-57 is a double wall of 20-grit sandpaper.
It's a dual VCA. Each channel can also be used as an instrument/mic preamp with up to 50+ dB of gain available. It can be set for a sweet and happy clean sound, it can do some meaty tube distortion, or it can be set to rip your scalp off and pound your balls into a nice sausage meat to add to your lovely omelette. Plus, the INVERT switch sets channel 2's CV to operate its VCA oppositely to channel 1. That allows the R-57 to be used as a lovely stereo panner/crossfader.
Beware. This is not intended to be a nice, neat, clean, sweet and virginal VCA. It is what it is. It has a few warts and it will not reward idiotic usage. Big hug!
Power requirement: +-12v dc, 300 mA after warmup (800-850 mA cold startup is required for 3-5 seconds). Tiptop uZeus and "Happy Ending" power supplies cannot run the R-57 and are not recommended. Monorocket(tm), Analogue Systems(tm), Doepfer(tm) and other third-party cabinets should have no trouble powering the R-57.
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