Tweet
Hi forum, I had a SWR 900 head come in with a bad power switch and a broken knob, a few were dirty also.
replaced the power switch, no issues.
The knob was a bass tone control. I used a simple panel mount with leads to replace it. seems fine.
When I reassembled the amp it now has a brief, 15 second, clip light at power up, not sure that's normal. I can't get the manual to download fromt he swr website.
My problem that is certain is that the amp seems to have huge gain and is distorted. Even with the gain down all the way the clip light will light and then the compressor. Plugging into the eff. ret. shows the PA is fine.
I figure I got some wires messed up since everything is soldered in place, I guess they've never heard of disconnects.
I'm hoping someone else has run into this problem during a rebuild.
It seems to come from the circuit around the gain pot as removing this opamp makes the biggest difference. removed the tube and all the rest of the opamps and the clip led still lights during startup. not so with IC2 as the schematic calls it.
UE
replaced the power switch, no issues.
The knob was a bass tone control. I used a simple panel mount with leads to replace it. seems fine.
When I reassembled the amp it now has a brief, 15 second, clip light at power up, not sure that's normal. I can't get the manual to download fromt he swr website.
My problem that is certain is that the amp seems to have huge gain and is distorted. Even with the gain down all the way the clip light will light and then the compressor. Plugging into the eff. ret. shows the PA is fine.
I figure I got some wires messed up since everything is soldered in place, I guess they've never heard of disconnects.
I'm hoping someone else has run into this problem during a rebuild.
It seems to come from the circuit around the gain pot as removing this opamp makes the biggest difference. removed the tube and all the rest of the opamps and the clip led still lights during startup. not so with IC2 as the schematic calls it.
UE
Comment