Power consumption, AC waveforms, 2T 4T controls, physical size and portability, among others. But the newer inverter based machines truly blow them out of the water in a lot of ways. The old transformer tanks are reliable, good welders. They're very durable, and they made a million of the things, so parts are out there should you need any. Of the three you listed, I'd get the Miller. Is there a more common-brand machine that would have a compatible pedal if I wanted one? What do you guys think?Īlso, I've been told that if I wanted a foot pedal for the Marquette, it's going to be a pain to find one due it not being a simple 5v circuit. Likely wouldn't touch that hardly ever anyway I guess. The Lincoln has a 40% duty cycle, Marquette 60% duty cycle, and not sure about the Miller. Been wanting to get into TIG for a while, don't want to spend a boat-load on one though. For welders, I currently have the usual Lincoln 225ac red tombstone stick welder, and a Century 130 120v mig with small tank. I have enough power to run any of them, all are single phase machines. Prices are descending respectively, Lincoln $850 (which I've been told is way too much), Miller $500, and "make offer" on Marquette. Marquette would come with water cooled torch, 5gal bucket with pump (same setup as the Miller). Miller would come with liquid cooled torch, foot pedal, water pump. The Lincoln would come with a tank, no reg, air cooled torch with finger on/off trigger, few cups and lenses, cart. I'm considering a TIG welder, trying to decide between a Lincoln IdealArc 250 AC/DC, Miller 330 A/B, or Marquette 300amp AC/DC TIG.