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Ampeg J-12D
vecher
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Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale State, Province, Country: PA
#1

09-02-2021, 11:32 AM
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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Radioroslyn
Phorum Expert
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Posts: 7,286
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Joined: Dec 2009
City: Roslyn Pa
#2

09-02-2021, 11:56 AM
https://ampeg.com/support/files/Schemati...ematic.pdf
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Vintage Hi-Fi, Stereo and Audio