Large Tesla coil fired off in a very large old factory. Using a Sony MZ-RH1 Minidisc recorder with unmodified Panasonic WM-61 electret condenser microphone capsules.
I don't know the voltage but I think it is similar to these specification for another coil by the same people at: http://www.lod.org/Projects/120L50K/40kWspecs.htmlThe coil I recorded was 11 ft. (3.35m) across
Video of the coil firing (a camera flash shows the coil, at 1:18 min.).http://vimeo.com/5048544
Go to lod.org to see their ambitious Tesla projects.
Do you have an approximation of the voltage?
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920 x 245
481 x 86
375 x 30