28 watt EL-34 Hand Wired Class A Head. The Hammerhead MK II offers rich output tube overdrive with a unique personality and super simple signal path. Rock, hot blues, and pop guitarists will find wide range of tones from semi-clean to full on overdrive with just the right amount of vintage funk. The MK II offers a new single knob tone circuit with On/Off switch. Fully redesigned power supply vastly improving openness and 'Feel' while increasing sustain and clarity.Like the amps that inspired this guy, it works great with single coils and humbuckers and has a great throaty, harmonically rich midrange that allows for nice controllable feedback at low and high gain settings. Beano era Clapton, Led Zep I and II Supro tones are very easy to get on this amp, but its ability to give British style harmonics but with a clean tone is what makes this a winner.