howdy y'all I need a 50K adjustable resistor. Specs call for 4W and I guess at that size it would be a rheostat. P/N listed is Mallory M50MPK and I don't have any way to look that up. Can anyone give me any information on that and does anyone have one to spare? I can always used a wire wound adjustable resistor up to about a 25 watt size if anyone has one of those thanks Ronnie