Bill,
I have only struck a few seconds of arc with this beast to make sure it works. Again, I am totally making this up as I go along but, I was able to get pretty decent welds for a newbie. For sure, this thing will test my self-installed 20amp circuit. If you can get that old welder, that would be a real catch. They only have a couple moving parts and I think the switch contacts are still available as are the ON-OFF switches. There is a fan but that should be easy to get working. These old beasts have a well deserved reputation and that is why I could not pass up a shiny new one for 30% off retail.
bd,
My Lincoln and my HF helmets use standard mercury cell watch batteries, which are not rechargeable. On those helmets, there would be no point in a charging circuit because the batteries are non-rechargeable. You would think that if they were rechargeable, they would have been fitted with rechargeable batteries from the factory. On both of these helmets, the solar sensor is a type tuned to the high UV temps encountered in welding. Both will darken in bright sunlight and when grinding if not in the "GRINDING" mode.
The reason I am trying to get the word out is, last Spring when I started a project, I had not used my Lincoln helmet in a few months. It worked perfectly when I put it away. I struck my first arc and realized my helmet never darkened. I ended up with a flash burn on my right retina. Thankfully I was welding on really low power at the time.
Thankfully, that injury has nearly healed but, it was no fun for the six months I had a spot in my vision. That is when I started researching auto darkening helmets. The Lincoln owners manual warns the user to always use the test feature to make sure the battery is good. I do that religiously now, as well as proactively changing my battery annually. The HF helmet is very very vague in any mention of the battery, other than saying "It SHOULD last four or five years." It has no test feature and your first clue the battery is toast is when it fails. Not good.
Your eyes are precious. Without them, doing anything becomes a lot harder. The get plenty cranky with normal age. No need to beat them up like I did.
Just a word of caution...