I need your help on that point because this noise is running me crazy for mounths...
One of my friends, more exprerimented than me, build for me a '68 JMP50 clone with PPIMV, based on this layout :
http://home.comcast.net/~jbjdav26/1987PPIMVr17.jpg
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EDIT : Pic from inside
http://imagesup.org/images12/1397300303-p1030733.jpg
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Transformers are from classic tone, I really love the sound.
The amp is a killer the sound is amazing. But there is a strange background noise a kind of buzz while I'm playing. Here what I try, whithout any improvement :
- change tubes
change jack
try another power outlet
check solders
try with another guitar (of course)
see :
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EDIT : precisions on the video :
On the video you can't hear the background noise that I talked. The buzz on the video is due to the fact that I was just in front of the amp at high volume with a strat. A half meter away from the amp there is no grounding noise at all.
In fact when I play, the vibrations are acting like if someone was taping constantly on the headshell, creating a kind of "Krrrrrrrrrrrr"... The noise is here ONLY if I play. If I don't play notes, no noise at all. That's why I'm taping on the headshell on the video.
There is no tube microphony either. I have checked them and try 3 different tube sets, always the same.
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As you can see in the video I tap on the head shell slightly ! The noise seems to be lower as the amp gets hot but never vanished. You have to be on the playing position (not in standby) to hear the noise, with a guitar plugged in with volume on.
Any Idea ?
Thanks !!!