Tube Amps / Music Electronics
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|6/5/2000 10:37 PM|
|Ric||Re: Chassis ping|
Ken, great suggestion.
The pre amp set-up I'm using is two 12ax7.
Pre using 1/2 the first tube,
Tone stack feeding vol. pot
Center pin feeds a resistor to the
First gain stage.
Second gain stage.
When I clip on to the grid side of the resistor of the first gain stage the amp turns into a AM radio. When I clip onto the pot side it hums but no microphonic. You can hear signal, plug in guitar and play, but it's very muffled.
Do you think there's a problem having three pins on that first tube goin' no where?
I've tried replacing the pot and the resistor but no luck.
This seems to me like a gain problem.
|6/6/2000 11:02 AM|
Tie the 3 unused pins together......better yet, parallel the two halves of the 12ax7 for a fatter tone. Just remember to adjust your resistor values accordingly.
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