I recently acquired a Reid surface grinder through eBay and it has...just so many problems. Right now I'm working on fixing the mag chuck that came with the machine. It's a DoAll Selectron with a Magna Lock. The issue I'm having is that a resistor attached to one of the vacuum tubes seems to be fried. When I try to magnetize the chuck, the resistor in question turns red hot, then the circuit breaker in the Selectron trips. I'm no electrician, but I'm going to try my hand at replacing the resistor. Only problem is I can't figure out what specs are required for a replacement. The only information printed on the other resistors is "Ohmite 200Ω" and I can't seem to find an Ohmite 200ohm resistor that looks like the one I got. They are about an inch long and look like a maroon tube. The vacuum tubes these resistors are attached to are 5U4 GB, and the Selectron uses 220v 175 watts. If anyone has any ideas on what resistor I should buy your help would be much appreciated.