Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 They have shoulder / ST

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

clear bottle 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This historical recording sounds pretty good

5 record cleaner and then played it on my Rega Planar Three

They have 280 739

Matched Pair RCA 7C5 Vacuum Tubes Gray And Silver Glass NOS NIB Mozart LP LM-1030 They have shoulder / STThis 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