I checked today, as I thought it was bigger but my small MIG is a SP100 from back in the mid to early 80's at least. I bought it used in '92, from the 2d owner who had it 7 years. And its a good'en, still in great shape even though the paint has faded to a kind of pinkish color instead of the original bright red. It will handle .035 hard or flux cored wire easy. In fact with this size wire I can easily get burn through on 1/8" steel, if I don't keep it moving. This is on "D-3" setting. It won't feed aluminum wire worth a damn even with a Teflon liner, and new rollers, but it makes some hell of beautiful welds with mix and stainless wire or CO2 and flux cored. Heck I have used it with CO2, and flux cored wire to bridge some big gaps using old 1/8th and 3/32d, 6010 and 6011 rods with damp flaking flux on them for filler.
Of course the secret is to have a good power source. I have 440v ran to my shop, then break it down to 220v going to five outlet boxes, each with its own run of 8 gage wire. At the outlet boxes I have one 220v 50amp, one 120v
20amp, and one 120v15amp outlet. My lathe, mill, band saw, grinder and air compressor are all hard wired to a different circuit. This keeps voltage drops to a minimum. Of course I have to pay a little extra for three meters. (House, boat/wood/welding shop, and machine shop w/central Air.) But it is worth it, with good power everything works like it is supposed to.