My limited knowledge of hum problems have to do with a cold solder someplace or a grouning problem. Something rarely discussed though with hums is if you have television Cable coming into your room. I had a horrible hum with my Arcam and Sugden amps and I bought a tv cable grounding device from Soundhounds for $10.00 and it got rid of the problem. I learned later that the the cable company had not ground the apartment properly so they coame out to fix it. Had I done that first it would have been free and I sould not need the $10.00 device. Same goes for power. BC Hydro has excellent power and if it doesn't get them to dfix it for free rahter than buying idiotic Monster power bars etc.

Interestingly my tube amp was the only amp that never had a hum problem when the SS amps did??? You could e-mail Paul - i believe they have built a few kits there and the repair guy there, I forget his name, is quite helpful.