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 Post subject: Ampeg J-12D
PostPosted: Sep Thu 02, 2021 4:31 pm 
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Joined: Jul Mon 11, 2016 5:54 pm
Posts: 479
Location: Lansdale,PA 19446
Does anyone have any information on this amp.. I replaced all caps .. when i turn it on... no mic connected its quite .. no hum.. but when i plug in a mic i get a load hum when i turn up the volume its a metal case mic as soon as i touch the mic the hum comes.. any clue on why? grounding ??

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 Post subject: Re: Ampeg J-12D
PostPosted: Sep Thu 02, 2021 6:52 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5263
Location: Rochester NY USA
Try another mike, or fix the ground on the one you have...

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 Post subject: Re: Ampeg J-12D
PostPosted: Sep Thu 02, 2021 7:05 pm 
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Location: Sunbury, Ohio 43074
+1 to that. Or clean the mic connector on the amp and on the mic. And check to make sure its the correct mic connector....if it's supposed to be a 3 conductor, and you're using one with two, or even visa versa, that could easily be the problem.

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