Hi folks,
Had one in to mend, and although I hate valve stuff have to admit this one seemed rather good.
Most interesting bit is the 100 Ohm WW resistor, where if output valve current gets too high, it unsolders itself and falls off before the mains transformer dies - Nifty in days before thermal fuses.
Usual problems are all the caps as were 60s rubbish. Resistors, even the high value ones seem reliable in low voltage positions.
I only had to replace one ECC83 and all input/output connectors for Gold plated stuff to keep the quality up to spec. as all caps previously replaced - Attach shematic - Chris.