Powerlytic 36DX 4200uF, 250V Capacitor
Two of these capacitors work great for small to mid size DRSSTC Tesla coils. In a double configuration with 120VAC input, they will produce a 340VDC DC bus for a half-bridge or full-bridge. These are used in both the Plasmasonic 1.0 and Reference Design 1.0 systems which can produce output arcs over 6 feet in length.
This capacitor is also used as the DC bus capacitor in our Plasmasonic CW plasma speaker kit.
Click here for the datasheet (PDF)
Note: The photo is a represenative image of a powerlytic capacitor.