Re: The "Sussex" Homebrew Valve Tester.
I'd start with using ferrites on all wires, it has been discussed here in this thread and it was AVO who patented the meathod in their valve testers a long time ago.
Grid stopper resistor comes second after ferrites, from a few kiloohms up to tens of kiloohms is usually enough and in series with the grid wire close to the socket.
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Martin, Sweden
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