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vampyretim · 20th May 2016, 1:15 pm

Hi Lawrence,

the signal at the output of the preamp is fine until the valve warms up at that point the positive peaks start to clip.

I then measured the grid at -5V and a mere .4 of a volt across the cathode.

During the time this thing's on it sounds very unstable and I'm half expecting something to blow.

How's best to proceed?

Many thanks.

20th May 2016, 1:15 pm	#163
vampyretim Heptode Join Date: Aug 2011 Location: Bristol, UK. Posts: 538	Re: Solid state preamp for EL84 Hi Lawrence, the signal at the output of the preamp is fine until the valve warms up at that point the positive peaks start to clip. I then measured the grid at -5V and a mere .4 of a volt across the cathode. During the time this thing's on it sounds very unstable and I'm half expecting something to blow. How's best to proceed? Many thanks.