GUITAR HEAD AMPLIFIER Invective .120 HEAD Valve head 120 W RMS with 4 selected JJ 6L6GC valves. Three Clean Channels (with boost drive), Crunch and Lead. The Crunch and Lead Channels share three-band EQ with level and tone booster and an adjustable threshold noise gate. Master Presence and Resonance. 2 independent effect loops. Half-Power selector. Balanced recording output with MSDI speaker simulation. 2 9VDC 500mA outputs for powering the pedals. Bias adjustment easily. MIDI In, Out / Thru. Channel change, Boost ON / OFF, Master Boost ON / OFF, Loop ON / OFF and Gate ON / OFF selectable through included footswitch.