I am afflicted with a strange buzz from my MiniRec effects loop. I chased this for a long time assuming it was a problem with my outboard (HD500, several other pedals), but after trying every possible combination of cables, power, and configurations, I ultimately tried taking a 6 foot cable and plugging it straight from send to return. With the loop disengaged, the amp is as silent as would be expected. Hit the loop switch, and it develops both a hiss, a low frequency hum, and a buzz. Moving the cable around leads to changes in the frequency and level of the buzz, and the noise floor goes from tolerable to unacceptable. Same results with different cables.
Any idea what this could be? I love this amp, but the lack of a clean loop makes it a nonstarter. Does this sound like a problem with the loop tube?
Any idea what this could be? I love this amp, but the lack of a clean loop makes it a nonstarter. Does this sound like a problem with the loop tube?