This is a pedal version of the Sovtek MIG-50 amplifier in a 125B enclosure with ALL top jacks. It uses Jfets (2N5457's) instead of the tubes. It has an internal charge pump to convert a 9 volt power supply to run the circuit at 18 volts. DO NOT use a power supply that has more than 9 volts! It sounds great with both a guitar or bass and has a ton of output, The VOLUME control is the "gain/drive" and the MASTER is the master volume output. I used all high grade WIMA capacitors and Lumberg input and output jacks. It also has a relayed true bypass that uses a soft stomp, non clicking bypass footswitch. I built one for myself, and this second one that I am offering for sale.