The Yamaha GSP100 is a half-rack size guitar preamplifier designed for home recordings. It features two volume controls (GAIN and MASTER), a built-in distortion circuit, an UMB circuit for stereo sound, 3-band tone controls, and a parametric equalizer.
The unit requires a DC +12V power supply.
Only the YAMAHA PA-1B or PA-5 AC adaptor should be used.
Press the DIST switch to turn on the built-in distortion circuit.