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Cheap Variac Substitute?



Hi All,
    I recently got a catalog from Eagle America tools.  On page 49 is a
router motor speed controller rated up to 3 1/4 HP or 115 Volts/15 Amperes.
 It is on sale for $34.99.  The part # is 421-1300.  Web page is at:

 http://www.eagle-america-dot-com/

Question:  Has anyone tried this particular unit successfully on a Tesla
coil?  Did filters improve the performance of this unit (aka prevent it
from being cooked)?

Cheers,

Barry