White Noise?

I'd suspect one of the tubes in your Cary may be the culprit. If the preamp is off with the amps on does the noise still occur? If not look to the preamp and the tubes therein. Also consider that the noise may have occured before moving the system, but changing the position in the room has attenuated it so you hear it more clearly.

Marco

I'm not positive, but I think the "standby" in your Cary may be the same as a "Mute" which means no signal at all is passing out of the pre to the amps. Puzzling though about the Classe SS preamp making the same noise as that eliminates a tube or tubes as the culprit. When you say "White Noise" are you talking about a hissing or 'rushing' sound, or a humming sound? I assumed it to be more a hissing/rushing sound. If it is a hum that may be as simple as a ground loop problem, where you could try floating the ground on the AC connection(s) using a cheater plug (3 prongs go in, 2 prongs come out).

Marco