WerkSpace, Thanks for responding. The welder is a Airco 300 AC/DC HeliwelderV. Definitely has a good ground. What happens is, I have no spark in DCSP or DCRP, but a little spark in AC with HF on continuous. I'm beginning to believe the spark is only from the HF transformer (Tesla Coil). Also believe...

Tig welder has spark on start but won't increase the heat with pedal or dial, new control board, any suggestion were to look next. Thanks for looking.

thanks for the reply Steve,done all that, I believe that i'm losing power at The SCR's , still working on it when I get time, not giving up, but the new Miller Syncro 250 Dx is looking good.

Have a Airco 300 AC/DC Heliwelder V, worked great until flooded by Sandy, got 80 volts out of transformer, 40 ocv, ,gets barely any HF spark in DC. and not Voltage or spark in AC. Anyone got any ideals where to look. I replaced all the small 24v dc relays, have 110 volts at outlet. Thanks