Having a bit of an issue with the FX loop on my 2 Channel DR. I noticed today that the signal from the send to my TC Nova system was low. Then when turning up the channel volumes the amp produces a screeching feedback sound but no signal. It starts from around 9 o'clock and then stops just when the channel volume is maxed, then the guitar signal comes back.
Tapping the preamp tubes doesn't reveal any obvious microphonics, but switching the FX loop OOC fixes the issue, so I'm confident something in the loop circuit is the cause.
Also *ahem* I did the parallel to serial mod on it which might explain things. But it WAS working fine with the mod, so wondering if it could be something else. Any ideas?
Which valve is the loop driver? I could try to change that first.
Tapping the preamp tubes doesn't reveal any obvious microphonics, but switching the FX loop OOC fixes the issue, so I'm confident something in the loop circuit is the cause.
Also *ahem* I did the parallel to serial mod on it which might explain things. But it WAS working fine with the mod, so wondering if it could be something else. Any ideas?
Which valve is the loop driver? I could try to change that first.