[TCML] ferrite variac

[jhowson4@xxxxxxxxxxx]

hello all,
I am trying to make a home brew variac (for tesla coil use).  I got my hands on 4 (4in outer diameter 3in inner diameter 1in high) ferrite cores.  I am planning on stacking them together for one big ferrite core.  do you guys think that this will work for a variac core?  or do I need a laminated iron core?

many thanks 
Jay Howson
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