Matched Pair Sylvania 7C5 Vacuum Tubes Valves Gray Glass 5726 T14 short bases

short bases

anode radiators for cooler operation and longer tube life

but the bottle is firmly-cemented to it and there is no movement at all possible

WE CANNOT GUARANTEE FOR FAILURES AFTER POWER UP AS THERE IS NO WAY TO DETERMINE HOW TUBES WILL INTERACT WITH YOUR ELECTRONICS OR IF THEY WERE MISTREATED IN TRANSIT

new in box RCA triple mica 9002 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Sylvania 7C5 Vacuum Tubes Valves Gray Glass 5726 T14 short basesThis 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