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