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sparkymike · 24th Mar 2020, 9:03 pm

My original post on this fault was in December 2006 and I have just done a search but can't locate it on the forum. From memory, I was originally getting an oscillation which was getting louder by the second. However, that does not seem to be the case now, just getting a 50 hz. mains hum. I understand that the EF 86 can suffer from hum if the valve base is not up to scratch. Maybe next thing to check. I was going to inject a signal from my sig. generator. Am I correct in saying this would be pin 2 on the jones plug ? What range should I use on the sig.gen. ?
Mike.

24th Mar 2020, 9:03 pm	#20
sparkymike Octode Join Date: Dec 2006 Location: Colchester, Essex, UK. Posts: 1,075	Re: Quad 11 test run My original post on this fault was in December 2006 and I have just done a search but can't locate it on the forum. From memory, I was originally getting an oscillation which was getting louder by the second. However, that does not seem to be the case now, just getting a 50 hz. mains hum. I understand that the EF 86 can suffer from hum if the valve base is not up to scratch. Maybe next thing to check. I was going to inject a signal from my sig. generator. Am I correct in saying this would be pin 2 on the jones plug ? What range should I use on the sig.gen. ? Mike.