This came to see me a few days ago.
Supposedly played but low volume.
Arrived and no sound at all.
All lights, scope fired up (adjusted that, it was out of focus).
Had tuning and sound out of preamp (pre-outs OK).
Nothing from the amps, 2 or 4 mode.
Main caps test showed almost no DC on one cap.
Amps and power supply were recapped (good work, nice caps).
SO, someone may have been hunting a problem.
Tore into it and suspected bridge rectifier or blown cap (blown caps are rare, I've only found 3-4 in 100s of units).
Trying to unmount the half bridge, something was wrong.
Pulled hard and pin missing.
AH HA!
Trying to remove pin proved fruitless.
The pin had failed and the arc melted the pin and welded it into the socket!
I tore is all out and grabbed a nice 35A full bridge and reworked the mount a little.
Wired it all back up and dim bulbed it and A-OK on 150W bulb so back to line power.
NICE!
When I find a free week, I will finish the re-cap.
Supposedly played but low volume.
Arrived and no sound at all.
All lights, scope fired up (adjusted that, it was out of focus).
Had tuning and sound out of preamp (pre-outs OK).
Nothing from the amps, 2 or 4 mode.
Main caps test showed almost no DC on one cap.
Amps and power supply were recapped (good work, nice caps).
SO, someone may have been hunting a problem.
Tore into it and suspected bridge rectifier or blown cap (blown caps are rare, I've only found 3-4 in 100s of units).
Trying to unmount the half bridge, something was wrong.
Pulled hard and pin missing.
AH HA!
Trying to remove pin proved fruitless.
The pin had failed and the arc melted the pin and welded it into the socket!
I tore is all out and grabbed a nice 35A full bridge and reworked the mount a little.
Wired it all back up and dim bulbed it and A-OK on 150W bulb so back to line power.
NICE!
When I find a free week, I will finish the re-cap.
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