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Board is a PL14a. Do you want me to re install Q5 and measure base voltage of Q4?

Q5 tests good out of circuit

Hi Lee,I forgot to ask if it`s a simple as brushing it on to the board or do I have to unsolder all the wires beforehand. This is to check for broken traces, yes?

120vac in gets me .040vdc on left output and 101vdc on right :sad2: 101vdc also present on collector of Q5

I`m running with the MJ15024s, Joe ok`d that while I wait for a couple 410 he sent me.

With or without B+/B- 200R`s?

Quote Originally Posted by laatsch55 View Post " Take the dbt out of circuit and briing the variac up to 80 volts. Then see what you have bias and DC offset." I`m still in that mode, I have not brought the variac up beyond 90v without DBT. Should I revert back to DBT/Variac combo?

No heat anywhere, 10R`s are good.

OK, sorry for the retarded questions.. please bear with me. I just got home from work, give me a few minutes and I`ll report my findings.

The transistor terminology is confusing me, do you refer to Q`s 11 and 12 as pre drivers? If so, I could not tell you whether one is leaky or not, would you suggest swapping the two channels Q 11 and Q 12 to see if the problem follows suit? As for measuring Q5 collector voltage, what is the...

dbt out of circuit, rail 200R B+/B- in circuit, 80vac input= .024 on left output,+57 vdc on right. I must sign off for the night and resume Sunday after work. Feel free to send me more tests in the meantime. Big thanks to Lee and Joe.

Negative

yes

Yes. a 40watt in there at the moment

On C6 leads with good board clearance. No acetone.

I forgot to mention, D9 was replaced in LEFT. Lifted Right channel D9 with no change. Rail voltage +54 and -59

Here you go

yes

I have absolutely no problem carrying out any and all of your requests, whatever it takes. Yes, I did receive data sheets with the transistors, see attachment

Yes, no change