I bought a Miller Maxstar 151 TIG about 15 years ago when they first came out. It is a DC only, inverter machine and will sustain an arc down to 1 amp. This capability is very important in gun work because it allows fine control of the weld puddle size and also allows you to terminate a weld without leaving a crater. Of course, it is also a stick machine when you need to do some fabrication. It's only drawback is that it won't do aluminum since it is DC only.
The newer inverter machines are more capable(and cheaper) than mine and many will work both on 120 and 240 V. 150 amps is plenty for all gun work and the vast majority of general metalworking. There several good vendors out there, but Miller is hard to beat.
OB
