[Phil Allison[_3_]]

"Patrick Turneroid"


** Another of the Turneroid's famous red herrings:

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" Many Guitar amps have a hum nulling pot so hum from heaters can be nulled
but often is has no effect."

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Actually, very few tube guitar amps have such hum pots.

1970s Fender 50W and 100W combos being the only ones of any note.

The trim pot always works ( if it has not burnt out ) but you have to KNOW
how to do the adjustment.

First step, fit an open circuit 1/4 inch metal sleeved jack plug in the No 1
input.

Second step, turn up the volume till you hear 50/60Hz and harmonics coming
from the speakers.

Then adjust the trim pot to minimise the audible effect.



..... Phil