Hello, all. I need some suggestions about tracing a fault in my amp.
It's an Audio Note single ended jobbie with 300B power valves. I built it myself from a kit donkey's years ago and it has served very well. Trouble is, though I built it I have no idea how it works - I just followed the instructions. Anyway, it was working fine and I took it out of my system a few months ago, since which time it has just been sitting on a shelf doing nothing. I put it back into the system today, thinking it would be nice to hear it again. But what do I find? One channel has nothing but a rustling sound coming out of it - fairly gentle, not a cone-splitting sound. It takes twenty seconds or so to become apparent after switch-on, and it does not vary with the volume pot position. I have of course swapped valves out, swapped them round and generally faffed around with the possible easy fixes, but no joy. Any ideas where I ought to start looking inside for my problem?
IB