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Discussion in 'Ampage Area' started by erlomd, Apr 12, 2021.
Sorry I’m late to the gig but welcome erlomd!
the added resistor on the preamp tube killed the noise! now it’s sounding great! Thanks again guys for all the help and insight.
Now I have to find a way of killing the noise with my pedals! Hahaha (it’s never ending Huh?)
Fine @erlomd !
Yes, It's a very simple modification which is very efficient - the compulsory tip is to place the balancing resistors "at the feets" of the first preamp tube, the one which deals with the lowest signal level.
The nec-plus-ultra is to use a potentiometer instead of the two Rs, in order to fine-tune the cancellation of the hum. I do this on big amps, with gain, but it can be done on any model. It was notably done on SF 100W Twin-Reverbs, but not on BF ones...
Did you also tested the adjustable bias modification ?