Tube microphonics

Pure_Brew

Veteran and General Yakker
Joined
Sep 2, 2011
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New England
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Coffee filters
#1
Something odd happened with the Sovtek 12AX7LPS. I can hear some odd noise coming through headphones as I move my hand closer to the tube.hum. Also if I touch the unit. (Bellari). If I lightly touch the plastic volume knobs, I get a funny squeaking sound like the skin rubbing plastic is amplified xxxxx. The high frequency is also slightly distorted in the music. I tried reseating, same thing. The Tung sol doesn't do any of this.

I'm guessing something loosened up in the tube due to expansion and contraction.
 
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