I don't know where this paper you refer to about "hum troubleshooting" lives... thus I don't know what's in it.
Are you talking about "hum" you hear from the speakers (ground loop problem most likely) or emanating from a physical transformer on the Taboo? Is the hum constant in volume or go up and down with the volume control?
I've had a couple of components over the years that had "mechanical" humming/buzzing transformer issues. Sometimes this is related to some small amount of DC on the circuit you have the component plugged into.
Have you tried:
- unplug everything that is plugged into the same circuit/breaker as your taboo. If the hum goes away - one of the devices you unplugged is dumping DC back on to the circuit.
- if the above doesn't stop the hum, still leave all the stuff you unplugged in step #1 unplugged, and then disconnect your preamp/sources, etc. - whatever you have upstream of your Taboo. if the hum goes away, one of your upstream components may be passing DC.
- if none of the above has any impact on reducing the hum, there is likely a problem with your Taboo - call Decware.
also... Emotiva makes a device, the CMX-2, that is specifically designed to eliminate DC offset on your powerline.
http://emotiva.com/products/accessories/cmx-2I have one of these, that I plug some of my sources into, but my entire system is not drawing power thru it.
Every since I started plugging my source, preamp and amp all into the same circuit, my systems superfluous background noise has been nearly nonexistent. Then I subsequently started using a PS Audio power re-generator, and noise I didn't know I had disappeared, and detail I'd never heard before appeared - and the system is quiet as a tomb. No humming, no buzzing, nothing via 100db sensitivity speakers, nor any mechanical buzz at all either from any of the transformers of my Torii, nor from my tube preamp.