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Original Message
RE: Thup-thup-thup and static maybe an oscillation
Posted by Jim McShane on December 13, 2016 at 08:49:02:
I don't mean to be a pest or be insulting about this - but how did you check the sockets? And even if you did check them clean 'em well anyway!! You might be amazed at the dirt in there. It wouldn't hurt to clean the 9 pin sockets either.
If the noise is from both channels it has to be either something common to both channels (like the 12AX7) or the same fault showing up in both channels.