I have a very old REC-O-KUT T12 turntable with an AC motor. The resistor on the slide switch is bad and the turntable will not turn off. My question is would it be best to replace the resistor or install a potentiometer. I would have a finer adjustment with the potentiometer, but I would like to keep everything original. I also am having a problem making out the color bands on the resistor and may not be able to get the right resistor. Any ideas would be appreciated. Thank You