David Billington wrote:
I thought it was worthwile posting it as it does show some of the
details of the power side, if not the control system. It was mentioned
earlier in the thread that no schematics had been found so it may be of
some use. The welder is definitely AC and DC, if the schematic can't do
that then I guess the manual is wrong, but it is entitled "power
transistor controlled, AC/DC TIG arc welding power source".
The schematic very clearly shows a bridge rectifier at the output,
and the output terminals are marked "+" and "-".

Jon