Isolation transformer -low cost power conditioner?

Go over to AA on the Tweaks forum and search for the Jon Risch isolation transformer & ac filtering projects. Or search on google for Risch's web page. His designs to build either unit(including a surge protector) will be about as inexpensive as you'll get. If you're not into DIY then look for a use isolation transformer/filter from a medical application.

The Risch AC filter can be assembled fairly easily if you buy the complete (assembled) filter from diycable.com and put the rest together yourself (just a cord plus a male & female AC plug). Which cord & AC connectors to use can be a whole discussion in itself. I'm assembling one of these now.

Thanks for the help.

Look at the Richard Grey. This is pretty much what it is. A big choke.

Here is a very affordable isolation transformer that provides balanced power:

The Transcendent Balanced Power Supply

Other affordable power conditioners would be the Running Springs Haley, Blue Circle Music Rings, Balanced Power Technologies (BPT) transformers.

Good luck,

Rene