Very 70s looking amp!Rear rip in the grill and one of the top ones pushed in..Rubber grommet missingHorray! Mullards inside.. I and they test good! 2 missing.. I think they were broken when the grill were pushed inSold the valves for more than I paid for the amp!Sizeable power transformer… not PartridgeOutput TransformerLove the slanted front2 tubes missing.. rest later sold and a new set put inOne inverter tube on a PCB2 variable resistors.. bias adjustmentOne diode replaced on Bias supply I thinkNot the neatest wiring but not badnicely marked transformers manufacturer?Solid State preamp all looks original Mm really do not liek this external solid state front end..One resistor looks like it has been replaced on the inverter circuitEvidence of an arc on one of the output tube sockets. this needed replacing..OK after sometime I decided to use the basic chassis and build a very powerful one knob guitar amp.Voltage doubler needed for bias supplyPretty tightly packed in here nowEF86 Preamp used components wired freeform (rats nest style)EF86 preamp tube and ECC83 PI. Circuit the same (almost) as old AC30 Normal ChannelAll done need to think about the cab now.. use original or.. smaller new one? Interesting 150 Watt Guitar Amp head with Solid state front end and 6xEL34 output tubes! After a whole I decided to use the PA chassis and transformers for a high power guitar amp with a single volume knob using a preamp circuit similar to a EF86 Based AC30 design.