In a message dated 1/9/99 6:44:38 PM Pacific Standard Time, tesla-at-pupman-dot-com writes: << Original Poster: "Jeff Corr" <corr-at-enid-dot-com> >Not in the range of real large sparks, but I have achieved 104" from a 6.0" >diameter secondary. Doh! I thought hitting a 100" rod once was good! What power levels were you running? >> Jeff, I am using a 5kva transformer, running at about 35 amps. Ed Sonderman