I'm cautious to second guess Bryston, but I'm looking at the electrolytic caps in the feedback look and wondering if it wouldn't be a good idea to replace them with non-polarized Nichicon Muse. The input topology of the 1B preamp and 4B amp (schematics below, caps circled) is the same, and I have measured a couple of millivolts across the cap in the preamp so there's really no bias across them. These caps are approaching 30 years old and in the signal path, so they're going to get replaced anyway, so now is the time to make the change. Is this a smart move?
Jim
Jim