Noisy static when powering off my Bryston 4B-ST

Ask over at AudioCircle dot com in the Bryston circle. The guy in charge is James Tanner, a VIP honcho at Bryston. he can give you a true answer straight up.

www.audiocircle.com/index.php?board=57.0

A batch of 4b-st went out once upon a time with muting switches that were prone to fail over time. When working, the switch mutes the speaker taps at power down, so that you don't have to listen to the power bleed out through the speakers. I had one that went bad, and it sounds very much like what you're describing. Contact Bryston -- yes, they really are fantastic -- and they'll take care of it.

My McIntosh 2105 did that when a power supply capacitor was going bad.