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IMO the headamp transformer is radiating noise which causes the hum, but..

I think it is a strong large metal object (like an even bigger transformer in the amp) that will affect the electrical field around the headamp.. So when on the amp the electrical field is 'caught' by the amp metalwork. (Really just like sucked in!)
The the stray field (HUM) is no longer affecting the tubes etc.

Perhaps a metal shield around the headamp transformer with a strap to the ground of the powercord could fix it.
A piece of soft copper cut to bend around the sides of the transformer facing the rest of the electronics?
Then attach a wire to ground the metal to the ground of the powercord.
Stray AC radiation

Also some ferrite around it might work. Or those VPI block made of all steel in a wood case..
I read some new ones are being made and sold now...
Actually any thick metal, dense. to work on the radiated magnetic field will do.

So the amp position may be the PERFECT location for your head amp!


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  • IMO the headamp transformer is radiating noise which causes the hum, but.. - 3+4=5 20:38:45 05/20/17 (0)

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