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:
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?
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