Re: The "Sussex" Homebrew Valve Tester.
You could always put a switch in series with the diode, if it only causes problems with certain valves.
According to a certain well-known law, the additional inductance of the switch leads will counteract the phenomenon responsible for the misbehaviour, even when the switch is "on" .....
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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