2 RCA 2B7 Cunningham Radiotron Vacuum Tubes Valves Lot Of Two February 03 2021 This matched pair of Sylvania-MANUFACTURED

This matched pair of Sylvania-MANUFACTURED

46 and 50 where minimum (65%) is 30 and 100% is 47

The dust jacket is in nice condition

14 MM plates straddled by half-moons

2 RCA 2B7 Cunningham Radiotron Vacuum Tubes Valves Lot Of Two February 03 2021 This matched pair of Sylvania-MANUFACTUREDThis lot of two RCA Cunningham Radiotron 2B7 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas, emissions and transconductance. There were no shorts or gas and they tested as follows: Tube one measured 30 in its triode section where minimum (65%) is 25 and 100% is 38. Its diodes measured 57 and 54, respectively, where minimum (65%) is 40 40 and 100% is 61 61. Tube Two (triode): 32 Tube Two (diodes): 60 42 WE HAVE SCORES OF THOUSANDS