- 4W, guitar head-unit, two-tube chassis, preamp: 1 X 12AX7, power: 1 X EL84, solid-state rectifier, single channel, top black control panel, single input, three white chickenhead knobs (v, tone, three-way output power knob [4W, 1W, or 1/4W), power switch, external speaker jack, white covering, brown diagonal Vox grille cloth with Vox logo in upper right hand corner, mfg. summer 2009-disc.