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4hv.org :: Forums :: Tesla Coils
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M.O.V.s

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radioman
Tue Oct 19 2010, 02:21PM Print
radioman Registered Member #3026 Joined: Fri Jul 23 2010, 02:46PM
Location: Los Angeles, California, U.S.A.
Posts: 54
Can anyone recommend a specific M.O.V. for the Terry Filter I am trying to build? And where to get it? My NST is 7500 volts 30 ma if that makes a difference.

Thanks!
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Herr Zapp
Tue Oct 19 2010, 02:44PM
Herr Zapp Registered Member #480 Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
radioman -

The MOVs are not really necessary in a Terry filter, and have been problematic for some people.

1. If you set your safety gaps correctly, the MOVs are redundant.

2. There is typically a large tolerance on MOV "breakover" voltage, so when you string a number of them together in series, you really don't accurately know what voltage they begin to clamp at.

3. Having a fixed string of MOVs makes it more difficult to use a variac to "boost" NST output, or switch NSTs (like going from your current 7.5kV unit to a 9kV, or 10.5kV NST).

4. MOVs are limited-life devices.

Just set your safety gaps correctly and keep them clean, and build the Terry filter minus the MOVs.

Herr Zapp
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