No Variac?

  Hi All,
 I would just like to know if it is totaly necassary
to have a Variac on a Tesla Coil? .. I have just made 
a 4.25" 15Kv/60ma Tesla coil and i cant find a variac
anywhere. Is there anything i could use other than one? or could i
tune my coil in just running very little gap? I would really
appreciate any information


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