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mole42uk · 21st Sep 2013, 2:43 pm

It's a good morning!

Martin suggested, with reference to my problem with the Sussex, that maybe it was parasitic oscillation. It was. A 1nF capacitor between the grid wire on the selector switch and ground was all that it took to cure.

Now I get sensible results from the EL34s I bought recently.

Thanks Martin!

Best regards,
Richard

21st Sep 2013, 2:43 pm	#935
mole42uk Nonode Join Date: Aug 2010 Location: Resolven, Wales; and Bristol, England Posts: 2,608	Re: The "Sussex" Homebrew Valve Tester. It's a good morning! Martin suggested, with reference to my problem with the Sussex, that maybe it was parasitic oscillation. It was. A 1nF capacitor between the grid wire on the selector switch and ground was all that it took to cure. Now I get sensible results from the EL34s I bought recently. Thanks Martin! Best regards, Richard