Crate Blackheart BH100H Hot Head Guitar Amp Head, 100W All Tube with Attitude 100 Watts, Class A or Class AB Operation Class AB 100 Watts RMS in (Full Power) Pentode Mode, 50 Watts RMS in (Half Power) Triode Mode Class A 60 Watts RMS in (Full Power) Pentode Mode, 30W RMS in (Half Power) Triode Mode