Please test each of the transistors you replace to confirm which one(s) is/are dead.Īll of these s.s. I still don't like no apparent V BE drop on Q20. these voltages were the same before and after I replaced the output transistors and power supply components.Ĭorrection: the seven volts across Q19 B-E is most likely due to the B-E junction zenering out in reverse mode because its emitter is being pulled so far negative, not being open B-E as I said. also R59 - 4.7 ohms was open.Īll IC's check out as well as their power supply.in fact I can run the pre amp stage fine with no issues taking the signal from the insert jack all is normal.channel switching works 's in the power amp.there are no IC's there. and it responds when I turn the bias pot.Īll transistors have been curve traced and checked good.even still, as a precaution I replaced the bridge,power supply caps,all 4 outputs, Q9- is a J175 jfet in the insert jack circuit that was exploded. Oddly the bias voltage is right on the money. Voltage at + & - of speaker terminals is -21vdc. of the schematic.no IC's in power amp stage of this modelĬollector to ground voltages at outputs are + & -34 as indicated on schematic.Įmitter to ground and base to ground voltages are -21vdc on ALL 4 outputs.(not good) Let me be more specific-amp powered through test lamp-no load condition.this is the non-DSP version.
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