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Re: [TCML] Hazards of Asynchronious arc gaps?



Hi Herr Zapp,

I was doing it with an O scope and signal generator with all components in place in the primary and feeding across the gap. 10V p-p gave 70V at resonance. I have had a lot of trouble with the safety gap firing on that coil. and found one of the 12/60's has a dead side, probably due to the way the primary likes to ring. I was running the 100KV Fair Radio caps on it, and it needed them. They do get quite warm during longer runs, but haven't blown one...yet.

David E Weiss


Harold -

When you say "I have seen it go 7X on one coil", I assume you mean the peak voltage in the tank circuit?

How were you measuring the voltage in the tank circuit (i.e. what type of instrumentation was being used) when the spark gap failed to fire and the "ring-up" incidents occurred?

Even if the coil in question was only powered by a 9KV NST, being able to accurately measure 63KV or higher (7 X 9,000) is not an easy task, and I'm very interested to learn how you made these voltage measurements. Did you use a commercial HV divider, or some other means?

 Regards,
 Herr Zapp

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