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MooreDogger
 Post subject: Microphonic Input Jack?
PostPosted: Wed Jun 06, 2007 11:55 pm 
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Joined: Fri Mar 24, 2006 10:34 am
Posts: 22
Location: Queen's University
Hi guys,

I just built a variant of an AC30/4 and I'm having some weird behavior with the input jack. When I go to plug a cable in and I hit the medal ring on the outside of the jack a hi pitched ringing gets amplified through the amp. The input jack is grounded properly and the EF86 isn't microphonic. Any ideas?

Thanks!

Dan
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coco
 Post subject:
PostPosted: Wed Jun 27, 2007 1:18 pm 
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Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7519
Location: Canada
You could be setting off mechanical vibrations. What happens if you tap the chasis? Does it start to ringing? If so, on of your tubes is microphonic.

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