Shield Amp from preamp? suggestions?

Albert I appreciate the offer, very generous of you, but dont want you to go to that trouble . Thanks.

Darrylhifi, I have some spare Purist Isolation devices and I would loan you one or two for a test. You would be expected to pay shipping both ways and return them in good condition.

If they work you can find a dealer and order as mine are not for sale.

While I do have a ground loop , which I use a product similar to the Mondial to tame, I have to believe its the components being close to each other {about a foot apart} on different shelves. Only because when I have the amp on the floor the performance is noticably better, and additionally the center and surrounds perform better. The center and surrounds are on a different amp, so the Classe must be affecting the performance of the preamp. Like last night I ran test tones and noticed the center seemed weak. Also again I have never noticed the digital readout on the volume control to act strangely until the Classe was close to it. The amp has been on the floor twice, and each time it was placed back in the rack I noticed this problem with the volume display readout.

Are you sure that it is the amp and not just cables crossing over each other? Try isolating cables (only hook up one source, 2 speakers) and try it. Could it be a ground loop? Are you using a line conditioner? Final thought, can you turn the gain down on the amp?

Purist Audio manufacturers an isolation base that you can place between the two components. I have had good success with these and their appearance is attractive (gloss black plate).

There is something called mu-metal, which is used in shielding magnetic fields and should also work against electrical fields. You can probably find sellers if you perform an internet search. For full effect, you may want to partially wrap one of the components in a sheet of this relatively soft metal, rather than just put a sheet between the amp and preamp. If you wrap, don't forget to provide for component ventilation. Alternatively, for electrical insulation (versus magnetic), a sheet of copper attached to a ground might be adequate and easier to obtain. I have seen some lab applications where a grounded copper screen has been effective, allowing air flow and visual transparency. Good luck.