Hi Aaron, On 19 May 00, at 18:34, Tesla List wrote: > Original Poster: spam_proof-at-worldnet.att-dot-net <snip> > I'm wondering how some of the the other coilers on the list differentiate > between their "better" and "worse" coils (actually, I had fun building > even the worst of my coils). Is secondary/spark gap sound a good measure? In my opinion, it is a very good indicator. Doesn't need any test gear either. Regards, Malcolm