Matched Pair Sylvania 7C5 Vacuum Tubes Valves Gray Glass 5726 T14 This black plate GE 5Y3GT

This black plate GE 5Y3GT rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts

anode radiators for cooler operation and longer tube life

new in box RCA 8056 Nuvistor tube tested to spec on our Paul Hart-calibrated TV7/U

Both have BW date codes

Matched Pair Sylvania 7C5 Vacuum Tubes Valves Gray Glass 5726 T14 This black plate GE 5Y3GTThis matched pair of Sylvania gray glass 7C5 tubes was tested on our Maxi Matcher 2 with 400 volts on the plates and a bias of 36 volt for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 2340 micromhos with a plate current draw of 24. 5 milliamps for Tube One and 2070 25. 2 for Tube Two. (New US made 7C5s typically test with plate current from the mid teens to mid 30s with transconductance from 2300 micromhos