Turn this amp around and you'll see a fistful of fuses, a series effects loop, a line/passive out with volume knob, and 2 speaker outs with switchable impedance from 4 to 16 ohms.
All THD 3 Models follow
This amp is pretty much perfect for what I require at the moment. The amp isn't an EXACT Marshall, despite the looks. However, it does give a unique take on the Marshall-y sound with borrowed properties from Vox and Fender amps.
The THD Hot Plate power attenuator is a must for any serious player looking for the rich tone breakup achieved only from playing his tube amp at high volume.