I would say a wasp in a jam jar would be far too quiet and probably too high a pitch so lets go for humming!
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I would say a wasp in a jam jar would be far too quiet and probably too high a pitch so lets go for humming!
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It's certainly looking like that's going to be the plan of action. I just wished I discovered the problem sooner as I was up in Yorkshire all of last week so could've taken it up to Glenn.
I guess I can still try and rule out a dodgy valve with the process provided by James, unless you think it's probably a waste of time and a valve is very unlikely to be the cause of my problem?
Location: London
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I'm James.
Hmm, just looked back to the original post. I had it in my mind that the hum was in one channel and thought heater:cathode leakage in a signal valve, but it seems it's in both, my bad, I must read more carefully next time. Apologies Alex. Given that the hum is in both channels and there are two sets of ECC83 that are probably not shared across both channels it becomes rather unlikely that two valves have failed, one on each side, simultaneously, so Andrews PSU option is more sensible. If you wish to play around then at least 85A2 valves are cheap and plentiful, they are almost always Mullard, and you can get them NOS from eg. Langrex, Billington and so on for about a fiver each plus postage.