stevem Messages: 4738 Registered: June 2004 Location: NY
Senior Member
A easy test to make if you can't test the 4 outputs directly for leakage is to swap them in pairs around each side of the thermal breaker.
If the + .210 VDC you have on the jack goes to a negative, then one of those two outputs on the negative rail is leaking, or one of them is very very unmatched to the other 3 .
All K 250 and 150 metal face amps like you have, have or had a reverb lock.
I guess you now have a hole in the center rear of the back panel?