I have been beset lately with noises, and I suspect capacitors. Tubes may be another possibility. Line surges are somewhat unlikely but not impossible, as I have a Square D whole house unit upstream of the individual protectors the plugs go into. One of these could be bad. My signal path is so complex I need to narrow this down a little and any help is appreciated. The noises I describe are channel specific, but different channels!
The sounds are mostly cracks and pops, very similar to vinyl noises but much sharper and louder (nice definition, the 4345's reproduce them with unfortunately terrific fidelity. Go JBL!) There are some thumps, too. These all come and go. These are in the right channel.
Another class of sounds was so horrible and destructive sounding that I pulled the likely amp out of the path. These beauties were hissing building from low level to a really loud "sssssss" and ending with a very loud BANG!. Then normal operation until the next incident. So bad I feared damage to the speaker, but I got lucky. This may have been a 6260 as I haven't heard it since switching out the amp; so no tubes there. Still, I could not tell if it was on some or all transducers, so the 5235 is suspect too. This was a left channel problem.
I am switching components like mad to isolate the source, but I would still love to know what exactly to look for when I have the culprit component in hand. Jolida JD100 CD player (tube output), some non-electronic source switching, 5235 xover, 6290 low and Grommes PHI-26 (SET) high. All to biamped 4345's with stock networks, which I also suspect for no particular reason.
I am of course going to look for any visible arcs, but this takes time and I'm not there yet. Sparks make great signal sources, I've heard them elsewhere.
Thanks, Clark in Peoria