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The R-51 is a special application of remote-cutoff pentodes, also known as variable-mu pentodes. It is optimized for general use in the professional modular synthesizer studio. All panel inputs and outputs are compatible with other synthesizer modules, and cannot damage other modules connected to them. Two remote-cutoff pentodes are connected in typical series RC-coupled connection. The distortion of the pentodes is adjustable with the front-panel DISTORTION CV TRIM control, in parallel with the DISTORTION CV INPUTs. This injects the CV into the cathodes of the pentodes, producing a voltagevariable or knob-variable asymmetric clipping distortion. Because this distortion is "soft", meaning has rounded waveform edges, it is typical of distortion produced by vacuum tubes when overdriven. At the same time, the screen grids of the pentodes are variable with the VCA CV TRIM control, in parallel with the VCA CV INPUTs--thus controlling the module's voltage gain. By properly adjusting VCA CV TRIM, the module is usable as a typical synthesizer VCA. When adjusted for full cutoff, the output is down at least -80dB from full strength. The audio input is 500k ohms, and all CV inputs have 1 megohm impedance. The audio output is able to drive a 600-ohm load. The audio input can accept any signal and cannot be damaged by overvoltage. The CV inputs are limited to +-10v rangePlease message for exact shipping quotes

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