[GarySP]

Thanks for the info, John.  I'll use your advice.  If the wire wounds Ohm out to spec, they stay in.  All the old carbons are going to be replaced.  Next question is about the rectifier in the unit.  The parts list describes it as a copper oxide 1/2wave B/1 Schauer 2 lead  Triplett part # T-2248-1.  Could not find any data about this particular rectifier.  Do these rectifiers stand the test of time, or should I consider replacement with a diode?  I don't think any real current runs through it based on the fine wire leads coming from it.  They look to be about 22ga. Any thoughts?  Take care, Gary