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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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sophia2005
PostPosted: Tue Feb 18, 2025 2:38 am 
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It sounds like you might have a grounding or shielding issue. Try checking for a poor ground connection at the input jack, ensuring all ground points are solid. Also, verify that the grid stopper resistor on the EF86 is properly placed and of the correct value. If the issue persists, try using a shielded cable for the input wiring and grounding it at one end only.
Stimulation Clicker
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