You might want to touch base with Doug about what a one tube wonder might need. 575 is found in Canada and border areas of the northern USA.I know on the New Orthos (SHF-8, 9, 7-HF-5, 6-HF-5, etc.) that have the selenium rectifier, all you have to do is install the diode right in place of the selenium with no additional resistance needed. could be 230 on the low side and 250 on the high side anywhere between is ok. Voltage will depend on your line voltage. Should be between 125 and 115 volts if connected right. If you can't tell, connect 230 volts and then measure the voltage at the 115 volt feeder plug. Your data plate and the label on the primary terminals should match and that is what you use to connect the welder. Miller sometimes used a second small sticker with the correct primary connection next to it. ON your line jumpers, yes the diagram pasted inside the welder might show the wrong primary connections. Just use diodes with a PIV rating of 250 volts or more and the complete assemble is rated for 200 amp or more. your choice on if you build your own or buy one assembled. Plates with pressed in diodes and assembled in two to six diode configurations. Then there are diode heat sink assemblies of different sizes. must be mounted on a AL ,plate heat sink. Diode blocks from two to six in different sizes. single diodes of varying shapes and sizes. I will try to attach both pictures of the wiring diagram here also but I am a better welder than computer guy I am sure someone has done this before as these are tough old welders great for a shop with no worries of fancy board failures. It is serial number M282321 Should it be the selenium rectifier restistance increasing therefore lowering my output voltage is there a way I can put in some newer silicon diodes or bridge rectifier to replace my current rectifier. I will have to try to ring these out with my meter to see which one is correct.
The wiring diagram shows it is wired for 208. I have checked the straps and they are on the appropriate terminals although the wiring diagram and the input wiring strap location diagram are different. I have a older miller scp200c that I recently acquired It appears the rectifier is on its way out as my no load voltage is at about 1/2 if what it should be throughout range.
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