Thread: tube question
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  #11  
Old 10-26-2011, 05:59 PM
old_coot88 old_coot88 is offline
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Quote:
Originally Posted by radio nut View Post
... it gets a ringing noise in the speaker. when this happens if i tap the amplifier chassis the ringing gets louder as I'm tapping. What in the world causes this?
Almost certainly a microphonic tube.
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