Jet City Amplification JCA22H 20W Tube Guitar Amp Head Black Channels: Crunch and Overdrive Controls: Crunch and Overdrive Gain, Bass, Middle, Treble, Crunch and Overdrive Master, Presence Effects Loop: Tube Buffered, Serial Tubes: 5x 12AX7 Preamp / 2x EL84 Power Heater/Filament Current: DC