Tube Amp Hum

Heres a theory...I have Herbies Audio Lab isolation feet, which have a good reputation and I am pleased with them. But...Is is possible that because they are squishy material, the transformer hum noise is being trapped inside the amp and coming through the speakers?

Just a thought, maybe its stupid but thought I would throw it out there.

I have tried cheater plugs, different circuits, moving the amp to a slightly different location, reversing the input tubes and the hum is still there.

In addition to the above mentioned, does a cable TV box share the same outlet or AC line? Also are your interconnects unshielded? Is your preamp tube or solid state? I purchased a new tube rectified preamp a while back to use on a solid state power amp and I was never completely able to eliminate low level hum, only reduce it but it sounded good enough to overlook. If overly concerned you may want to contact VTL in California. Congrats on your new VTL amp, an excellent choice!

Thanks Phd, its a tubed Pre. A 2.5 soon to be a 5.5 in about 2 weeks. The line the audio system is on is dedicated to it, not cable tv on the same line at all. Cable TV near it, but no connected in any way whatsoever. The cables I have are shielded (Nordost Frey) 97% according to the specs on the Nordost website. Although I am going to try some other interconnects at some point just to eliminate them as a possibility. The ICs have a tendency to be very sensitive in general so it is a possibility I guess.

My feeling is this is just simple and honest transformer hum, and nothing more. But I still think I need to go through the steps of eliminating everything else as a possibility.

My brand new ARC VS60 has what you describe. Same in both channels. I have a feeling this is how it goes but left a message with ARC. I'll see what they have to say. I hope it can be eliminated. My solid state amp was dead silent.