On Friday evening one channel suddenly dropped in volume and lost it's top end. This was followed by a nasty burning smell from one of the 300B PSE monoblocks. I turned everything off and went to bed!
When I tried the amp again on Saturday I noticed one of the 300B valves was getting really hot. A bit of poking around with a test meter and a shorted cap was soon identified. It was a 100v 100uF Black Gate cathode bypass cap.
Black Gates aren't available any more, so I've ordered a quartet of the Elna Silmic IIs to replace all the Black Gates. Should arrive tomorrow.
Has anyone used these? Do you have any views on them? Do they need to burn in like the Black Gates, which always needed a fair bit of running in before they "popped" and start sounding right.