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