I was messing with my JTM45 clone today.

HomespunEffects

Rock Star
TGF Recording Artist
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2,515
I changed out the grid stopper resistors on the input and added a capacitor to ground as mentioned in this article: http://www.valvewizard.co.uk/gridstopper.html

It really does lower the noise floor and i think it’s a worthwhile mod. It’s easy and reversible. I think it raises the gain a tiny smidge as well due to the lower resistance between the guitar and first stage. Give it try.
 
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