old sp125 vs newer 140 which is smarter?

[BS_Meese]

Looking at a Lincoln SP125 Plus in a pawn shop... clean, cheap, but honestly wondering if it's even worth it in 2025. A buddy of mine needs a 120v MIG for light work, and I'm trying to figure out if this old SP is a gem or just nostalgia. Specs are close to a Pro Mig 140, but the SP's continuous voltage control is the only real advantage I see. The 140's tapped settings aren't as "fine," but in practice most people just run within a couple windows anyway. Plus, the Pro Migs are newer and easier to get parts for. So what's the real story? is the SP125 actually built better than the box-store 140s, or are both machines limited by 120v power no matter what?

 

[carl_1976]

I got an SP125 Plus in 2018 for small jobs in my garage, and it still works great. It's built strong with a metal case and smooth wire feed. The voltage control helps a lot when working with thin metal. But since it runs on 120v, it has limits like other small welders. If it looks clean and the price is good, it's a nice choice. Just check that the gun and wire feed work well, parts can be hard to find, but I don't think it's impossible.

 

[Sun.day]

SP125 Plus is still a solid 120V MIG smooth arc and infinite controls make it nice for light work. The Pro MIG 140 is newer with easier parts and support, so it's more convenient long term

 

[gasolineholder]

Continuous voltage control is nice but not a game changer for light work, 140's tap settings work fine for most hobbyist stuff. I suppport the SP idea but if prices are close, go with the 140 just for parts availability and warranty support
How cheap is cheap at the pawn shop?