2 RCA 2B7 Cunningham Radiotron Vacuum Tubes Valves Lot Of Two February 03 2021 new in box RCA 6DS4

new in box RCA 6DS4 nuvistor tube tested to spec on our Paul Hart-calibrated TV7/U

This matched pair of Sylvania-MANUFACTURED

These tubes have great bass and sparkling highs and Pete Ham's voice is warm and clear as a bell

14 MM plates straddled by half-moons

They tested 54

2 RCA 2B7 Cunningham Radiotron Vacuum Tubes Valves Lot Of Two February 03 2021 new in box RCA 6DS4This 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