Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 harp getter with sheet) measured

harp getter with sheet) measured 44 while Tube Two (12B4A

The 1P21 is missing a pin

ZENITH-LABELED) measured 74/76 while Tube Two measured 76/78 where minimum (65%) is 50/50 and 100% is 77/77

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

This lot of three Sylvania tall base

Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 harp getter with sheet) measuredThis 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