Power socket haning out.. no eath connected..Oops power socket haning off, and back panel missingReverb tank in top of cabQuite neat single layer PCBLook there is one loney tube in there! all tested goodRepaired socketOutput stage…. dead… short circuitPower amp removedBoard clamped ready to unsolder the amp chipNew chip soldered in and ready to test! She worked!All running well on the bench now! Tatty Marshall AVT50 in for a fix.. dead… power amp shorted was main issue.. common problem with these amps… heat sinking minimal.. all fixed and sounding very “Marshally”