I built a small cockroft walton voltage multiplier with 4 stages to quadruple the 120V mains. When I measure from the end of the multiplier to neutral with a multimeter set to DC volts, I'm only getting around 132V. Honestly I'm stumped. If it helps, the components I'm using is vishay WKO series 2.2nF ceramic caps, and vishay P600M 1000V 6.0A diodes. Any help or suggestions would be great.