From: - Omega -[SMTP:seraphim-at-WPI.EDU] Sent: Friday, November 14, 1997 10:26 AM To: Tesla List Subject: Re: Medhurst problem To tesla list, Does anyone know of a truly accurate final output voltage formula? I m also looking for detailed formulas for spiral and inverted cone primary windings. Also does anybody know if the H & R 5kv -at- 300MA tranformers require ballast resistors? Thanks, Joshua Resnick