RO OpATube III 2-Channel Preamp PUBLIC

Richter Original "OpATube III" 2-Channel Guitar Preamp

Richter Original "OpATube III" 2-channel guitar preamp. Largely the same as the first RO OpATube version but with a different tube and an extra volume pot. Here, the 12U7 dual triode is used (not a 12AU7), which is designed to work using a single +12VDC supply-voltage on the plates AND the heaters (originally from a car battery). [Do not use any other tube, including a 12AU7.] Controls Include: Input Level, Ch 1 Enable switch, OA Gain, OA Tone (Bass, Mid-Center, Treble), Fuzz 1 enable switch, Fuzz 1 symmetry switches, Fuzz 1 Depth, OA Level, Ch 2 Enable switch, Tube Drive, Tube Phase switch, Tube Level, and master Blend. Specs for both channels are the same as with the first version of the RO OpATube 2-Channel Preamp. And the power-supply is also the same.