I've posted part 4 of my SCR-284 series with information on the PE-104 vibrator supply. Part 4 covers: ID of your version of the PE-104 Filament Ballast Info Vibrator Info Test Tools Testing using low voltage AC. Capacitor replacement. http://k4che.com/SCR-284/SCR-284%20Part%204/SCR-284%20Part4.htm 73 k4che