This is an awesome sounding little valve head that you can drive and get a great rock sound. It is the SC20H Studio Classic JCM800 20watt head. This is what Marshall says about it.
The original JCM800 2203 changed the face of modern amplifiers forever. Updated and enhanced, the Studio Classic SC20H is here to do it all over again. Replicating our first amp that truly embodied the overdriven sound of heavy rock, the portable SC20H brings timeless sounds to the modern guitarist, with the option to switch between 20W and 5W at the flick of a button.
Output Wattage: 20W (with power reduction option to 5W)
Outputs: 5 x 1/4” jack sockets, selectable 16Ω / 8Ω / 4Ω load
Inputs: 2 x 1/4″ jack instrument inputs (high/low sensitivity)
Controls: Presence, bass, middle, treble, master volume, preamp volume
Effects Loop: Yes, series, send/return
Preamp Valves: 2 x ECC83, 1 x ECC83 (phase splitter)
Power Amp Valves: 2 x EL34
Cable: Detachable power cable included, speaker cable included
Weight: 9.4 kg / 20.7 lbs
Width: 510mm / 20.1″
Height: 240mm / 9.4″
Depth: 240mm / 9.4″