An electrical connection is provided to opposite ends of the cathode through {HEAD ~ two or more low resistance resistors} with {TAIL ~ high temperature coefficients} of resistance 
with
An electrical connection is provided to opposite ends of the cathode through { HEAD ~ two or more low resistance resistors } with { TAIL ~ high temperature coefficients } of resistance
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH