Orange AD200B MK 3 200W Bass Head Controls: gain, bass, middle, treble, master Features: Dual output (passive archive), Slave out, Failure fuse Output: 200W (RMS) Tubes: preamp - 2 x ECC83, 1 x ECC81/12AT7; output - 4 x 6550/KT88 Speaker impedance: 1 x 8ohms; 2 x 4ohms