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Strange issue - occasional low frequency noise in one channel

Posted: Sun Nov 06, 2022 10:06 pm
by djhurley92
Hey,

I built my KT88 amp following Mark’s videos back in 2020, and have used it as my main amp weekly with no issues. In the last week I’ve had these really strange low frequency noises / energy bursts in the right channel that happen at random.

It is difficult to explain so here is a video, the bursts start 15 seconds in:

https://youtu.be/9mTyRTkVY0w

As you can see the noises / bursts persist after I turn the volume down, so it is not source-related.

I’ve tried changing all the tubes and this has not fixed the issue. Any idea what could be causing this?

Thanks
David