[TCML] Alternate to a spark gap

[Brian Hall <brianh4242@xxxxxxxxxxx>]

I noticed that one of the loudest parts of a spark gap coil is the spark gap itself.
 
So, could I just turn my 15/30 NST on and off rapidly through a 555 driving a mosfet or power transistor (than can handle house current, or even dialed down a bit through a variac) ?  Would it do any harm to the primary of the NST, being on and off that way?  As its usually the secondary alternating rapidly through th SG...

and by the way I happened to notices they have mosfets at radioshack in the parts drawer now for about 2 bucks 

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Brian Hall 
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