So just a hum eliminator huh? Been looking around and they're quite cheap in the US if you can find an Ebtech, here in the EU they charge 200-250 eur for a Morley stereo hum eliminator (Ebtech nowhere to be found, sold out), but I think that is a crazy price for such a simple device and saw mixed reviews, some say it works like a charm and others that it does not and it only changes the frequency of the hum. So ... I don't know, will try to find someone who's got one and try it. But I think that my issues are not that severe as yours were. Thanks for sharing.
I had friends try the amp but disnt want to use it due to the noise.
I have tons of pedals and some rack units and have quite a few amps Nad hav splayed since 1987.
This is the only amp I've owned that had loop noise with every pedal and every rack unit.
That said, I LOVE the tone and feel of this amp so I was determined to make it work for me. The Ebtech Hum Eliminator unit makes my amp silent.
For me I have it set on top of the amp with my amp return cable entering the unit. From there a small patch cable goes out to the amp return. That's it. Silent!
My tech said he could also probably fix it internally, but this is so easy, I don't think I need it. Maybe one day.
Works like a charm. Eliminates any noise/hum as advertised.
With my other amps I've never even needed a noise gate, even for super high gain.
I used a noise gate/suppressor years ago but then realized I don't need one. I have high gain amps such as modified Dual Rectifiers, Mark Vs and others and haven't found a noise suppression pedal necessary.