why balanced power last before component?

Ptss, you have it right. In my DIY balanced power supply, I put a big EMI/RFI block filter with good differential noise reduction figure ahead of the transformers.

http://i994.photobucket.com/albums/af67/mr_classe/Balanced%20Power/b_08.jpg~original

http://i994.photobucket.com/albums/af67/mr_classe/Balanced%20Power/b_10.jpg~original

Thanks Gbart. i will look up later. :)

Gbart wow.. That's a fine looking unit. So appropriate to have the separate transformer. Where would you suggest for a transformer? Would you suggest some differential blockers?
Very slick work.

Plitron has a balanced isolation transformer, Part #8575-X0-02, that is available for sale to DIYers. Equi=Tech has factory B stock and "blems" available for sale direct from the factory from time to time. Toroid Corporation of Maryland also sells balanced isolation transformers. Factory quoted lead time is 2 weeks, but in my experience was more like 3 business days. The transformers in my unit pictured are from Toroid Corp. Schurter, Corcom and Qualtek make EMI/RFI filters that are suitable as pre-filters ahead of an isolation transformer. PM me at sae_2300@optimum.net if you need more specific details.

Here's the link to the Plitron order page:
http://shop.plitron.com/search_new.asp?Action=Search&SearchTerm=8575-X0-02&Search=Search

Glen