Mezmo, I've had this specific problem just as you described with the left channel of my Bryston 3bst. I wonder whether there may be a design flaw in the Bryston gear? I contacted Bryston, and they advised me that I likely had a 'mute' problem (whatever that is - sorry, I'm no engineer) and that I could return it to get it fixed. However, last month, I had a party at the house so I moved my system to the living room to entertain. Upon returning the system to my bedroom I find that I no longer have any trouble at all - perhaps it was just a lose connection or something. Anyway, I suggest you return it to Bryston - their service is great, and of course free. Good luck.
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.