These are probably the most desired JCM800 combo ever made. Vertical input module, the earlier vertical input models have hand wired input jacks and potentiometers unlike the later horizontal input jack models which use cheaper PC board mounted hardware, this is the most desirable model. It’s basically a model 2204 head in a 1x12 combo form. Just use your guitar volume to go from clean rhythms to crunch to searing lead. Great gigging amp/ great practice amp. Sounds like a classic Marshall without the buzzsaw diode clipping of the channel switching 90's Marshall's. New filter capacitors for the power supply and new output tubes.