Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 This lot of three Sylvania

This lot of three Sylvania tall base

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

This historical recording sounds pretty good

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

Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 This lot of three SylvaniaThis 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