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Re: MMC Question.

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Glen,

NO. Not really. The filter is intended to filter out the RF. The only overvoltage protection there is, is the safety gap and MOV's. The MOV's is intended as a last resort. The safety gap is the first line of defense if the main gap is opened up too wide. The maximum voltage you will get is the lesser of the breakdown voltage of the main gap or the safety gap and these will protect against resonant rise only if properly set. If you have a LTR value Cp there will be less potential overvoltage but never the less, overvoltage is still possible with an improperly set safety and main gap. With the recommended LTR value, the steady state voltage will be safe but once the SG fires the first time, there will be transient voltages in addition to steady state that could add and double the voltage from the steady state value.

Gerry R.

Original poster: "Glen McGowan" <glen.mcgowan@xxxxxxxxx>

Will the filter Terry developed protect the NST in the event of resonance or would the filter resonate as well along with the NST?

As I understand it I'm currently in the neighborhood of less desirable capacitance. As Scott,Barton and others have pointed out it's not a particularly good idea to let the NST resonate but with my current MMC (.0094uF) would I suffer any adverse effects? I guess the question is more along the lines of being that .0094uF is pretty close to .0106uF would it resonate or would my capacitance need to match .0106uF before NST resonance would kick in? How exact do I need to be is what I'm asking.

Looking back at the statement I made about the NST "preferring" .0106uF it seems I was quit mistaken and the .0106uF should be treated as a boundary rather than a goal. I'm learning.