Are you talking about the 4 1/2" by 6". I believe the saws made by Northern, Harbor Freight, Jet and Grizzly maybe some others are made in the same factory but have different specs. But some have a huge difference in price, if you are going to mail order the saw i would order a Grizzly, I'...

The way the tacks go in should tell you the correct amps. Try just practice tacking all the way around a coupon, to get a better feel for the amps setting. I prefer a 1/8" land with a 3/32 gap for uphill 6010. 80 amps is where I have been running at using a lincoln invertec 350. The 10 to 12 o'...