Overheating EL84 - Leak TL/12Plus
Firstly, many thanks to HiFi Engine for the wiring diagram for this amp.
Valve V4 of this mono amp is overheating. Following a suggestion by GeoffH about another valve amp with a similar problem, I checked the grid resistor (it's OK) and I have replaced the cathode electrolytic but with no success. I then set about swapping components between V3 and V4 to see if I could switch the problem from V4 to V3 and thus isolate it. Again, no success. The voltage at the V3 cathode is around 15v but it gets up towards 40v on V4. (On a second TL/12Plus I have, there is also a discrepancy but it's not as marked - about 15v vs.25v.)
Any suggestions would be appreciated.