andrew wrote:
Just as a longshot: a belgian friend of mine has a mig welder

MH Weltronic systems /BIRMINGHAM 5164 // Tiger MK3 (Tig HF unit )
Mfd 1990 .

Which has blown some electronics, apparently the IC chips aren't
identifiable, the firm is out of business and he's looking for a circuit
diagram.

AJH
Post a question here http://www.mig-welding.co.uk/forum/index.php

both private and trade welders hang out here.

Bob