Hum in my machine!

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Hum in my machine!

Postby clnsdlpr » Thu May 15, 2014 2:04 pm

Guys, I have this problem more than I like to think. I need some input. I have a basic Fender 2 x 12ax7 circuit. 1M Volume control after the tone stack. Up to the 12 o'clock position. Noise level is low. Last half of the clock (12>6) is where I get lots more noise. No grid resistor. What's up?
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Re: Hum in my machine!

Postby Geek » Thu May 15, 2014 2:42 pm


Homebrew Fender ckt? Layout is critical. You may have an oscillation.

Commercial ckt? Roll the tubes, one might just be noisy.

Hope that helps.

-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
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