Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 Transconductance measured 116%/104% where minimum

Transconductance measured 116%/104% where minimum (65%) is 70%/70%

The 1P21 is missing a pin

They have shoulder / ST / Coke-bottle bottles and dimpled-sheet getters

new in box Zenith 6GV5 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 Transconductance measured 116%/104% where minimumThis new old stock, new in box matched pair of Sylvania gray glass 7C5 tubse 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 3100 micromhos with a plate current draw of 37. 4 milliamps for Tube One and 2740 38. 7 for Tube Two. (New US made 7C5s typically test with plate current from the mid teens to mid 30s with