Blackstar S150H Blackstar Series One Head 50W 50 Watt, all-tube, high-gain head with Master Volume, Resonance and Presence controls Tube Complement: 3 x ECC83 (12AX7), 1 x ECC82 (12AU7); 2 x EL34 Power Tubes 2 Channels, 4 Modes: Clean (Bright, Warm); Overdrive (Crunch; Super Crunch); 3-Band EQ Exclusive ISF and DPR controls; Emulated Speaker Output; Series Effects Loop with Level switch FS-2 foot controller for changing modes; also responds to MIDI switching