The amp goes into standby after about 5 seconds. All the output transistors checked ok, so I put an oscilloscope on supplies and checked +/- B (50 volts). The +50volts are fine, but the -50volts supply goes to -50volts and then within a second goes back to zero. It has dual parallel bridge rectifiers, so at this point I am assuming the main power supply caps, even though they checked out at 6800uf. It is not the transformer, since I am getting a full sine wave even as the -50volt supply dwindles. Main caps????????
- posted
16 years ago