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SRSG Question



Original poster: stanmoore-at-mindspring-dot-com 

When reading posts on the sync spark gap, I see references to using a variac to
control the supply voltage to the motor? Is this correct?  After you modify a
motor to make it synchronous, do you then also control the supply voltage to
achieve sync speed?  I am planning make an 1800 rpm sync motor.
 
 
Also are variacs used on the supply to a NST, say a 15/30?
 
 
Thanks,
 
 
Stan