Getting Rid of Transformer Hum

The irony mentioned by Ngjockey is what confused me. I've since read plenty of articles like the one Tvad provided (btw, thank you), on magnetostriction and DC. However, the consensus seems to be that all quality Toroids and modern electric equipment should be sufficient at removing DC. The ones proposing DC as a main problem all seem to be selling something. Still, there are people as there are here, in this thread, that says an isolation transformer, or a device like the Channel Islands Audio XDC-2 solved all their problems.

So here, I'm at crossroads with my wallet since I really don't want to spend colossal amounts of money (to me) on all these devices, which in my opinion, are being marked up ridiculously.

I'm entertaining, though, one alternative option. I could try to sell my Panamax "line conditioner", and buy a used voltage regulator, which should take care of magnetostriction, and to my underestanding, DC as well. Are there any opinions on this?
i.e. Monster AVS 2000, PS Audio Power Plant...

I'll probably end up getting the CIA XDC-2 if it turns out the Monster would be insufficient...

Sorry if that confused you. The irony is that transformers hate to have DC provided to them on the inlet but they do a great job of eliminating DC on the outlet side. Then, it usually gets rectified anyway.

That's why I didn't suggest using an isolation transformer in front of the amp. Although it would probably solve the noise in the amp by eliminating DC to it, the iso tranny would be just as likely to hum. The problem might just be relocated. And I like iso trannys.

Should also mention that the reason you don't see a lot of the Channel Islands type of thing and why the DaBlok is DIY is because capacitors aren't intended for AC mains and there is a slight chance of the caps going "poof" or "bang". No, we're not talking dynomite here but it's scary enough for manufacturers. Thus, the heavy duty case, expensive components and the cost.

Have you gone to your breaker panel yet and turned off everything except the wall outlets to the stereo? Unpugged the TV cable and any dimmers or 2 or 3-way lights? You might find the source of the DC is something that seems completely unrelated.

Tvad is right, there are other causes for noise besides DC but I'm stickin' to my story unless you prove me wrong. Maybe even after that.

Here's a post from Roger A. Modjeski on AudioCircle.

"One thing to keep in mind about toroids. If there is any DC on your power line the transformer will audibly buzz and the magnetizing current will go up. This is because they have no air gap. EI transformers have an unintentional air gap of about .001 inches. That's all it takes to keep a transformer happy with a volt or two on the line."

This is exactly in line with my own experience: toroidals all hum/buzz to a certain extent; amps (e.g. most tube amps) that use different styles of transformer tend not to...