Sorry it took me so long to sort out a photo. I have been away. Anyway, here's the modified board. The arrow points to the resistor. board.gif The resistor was 240K 1/4W and I fitted a 120K 0.6W. A 1/4W resistor would fit better but I only keep 0.6W in stock. The board is soldered with high melting ...

Yes I did think of that. The only reason why I haven't done it is because it would totally invalidate the warranty. You can hide a resistor change but it is difficult to hide a hole in the front panel and a new knob. By the way your guess was fairly close. If I remember correctly the resistor was 4k...

I recently bought a Portamig 285HD to replace my old Miller 150. It is a much nicer machine and so much smoother than the Miller. Portamig are a fairly small UK company that make welders to order. They are basic transformer welders but they are really well built.

I am really keen to make this modification to my own Cobel welder - so PLEASE for myself & anyone else with this welder let us in on the secret ! OK. I'll try to open it up on the weekend and take some pics. I can't believe I didn't take pics in the first place. I normally do when I do that sor...

I forgot to take pictures when I had it apart. If you really want to do this mod let me know and I'll take it all apart again. Unfortunately the front panel board is a pain to get at. The conversion itself was pretty easy. It was just a case of changing one resistor. Upping the frequency does seem t...

Technically you would have probably invalidated your warranty when you looked inside, definately you would have when you swapped the component. Of course. To be honest I doubt if the warranty is worth the paper it's written on. This came from a box-shifter that doesn't know much about welders so it...

I recently purchased a cheap Chinese 200A tig. This one is branded as Cobel http://www.ebay.co.uk/itm/321042647185 . I was quite impressed by it considering the price. Unlike many others this one uses a fabric sleeve on the torch cables so the cabling is very flexible. The foot pedal is also surpris...