Thread: Opinions on what's wrong? (Video attached)
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  #4  
Old 02-14-2012, 10:01 AM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
Posts: 2,645
Sounds like a microphonic tube causing an acoustic feedback loop. Possibly a 12AV7(12AT7). Try tapping on the tube and around that general area.
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