The transformer that I am using in my HT supply has 3 taps on the primary, in practice they equate to 4000,3500 and 3000 VDC. I wish to be able to switch them from the front of the supply, does anyone have a suitable rotary switch that they can sell me? It will need to handle 240 volts at 30 amps. I will be switching the supply off before changing the taps of course! Conrad G0RUZ