Contact Dennis at the Bryston U.S. service facility. While i no longer have a Bryston amp, he / they are phenomenal to deal with. If you send them an email via their website, they will typically respond quite quickly with the necessary info and phone numbers. Good luck and hope it's nothing serious. Even if it is, you won't be out much money at all due to Bryston's warranty. Sean PS.... When is the last time that you checked the humidity level in your house ? This sounds like a longshot / freak thing, but you might be surprised what a lack of moisture in the air can cause.
Horrific crackeling at power down...!?!
Ugh. A new problem. When I power down my amplifier (Bryston 4b-st) I get a truly horrifying crackeling / static sound through one or both speakers for a couple of seconds. I mean, this is a really scary sound, under the circumstances. I unplugged everything, recheched my ground, and it behaved. Once. Now it's back. Having exhausted my pathetically meager bag of tricks for dealing with electrical woes, what do I do? I'm half afraid to turn it back on again and, on the occasions when I do, I am even more afraid to turn it off (which I do rarely, in any event). Has happened three times, currently off. Help? Many, many thanks.