2 RCA 2B7 Cunningham Radiotron Vacuum Tubes Valves Lot Of Two February 03 2021

2 RCA 2B7 Cunningham Radiotron Vacuum Tubes Valves Lot Of Two February 03 2021This 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

They tested 54

Transconductance measured a perfectly-balanced 2700/2700 micromhos

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

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

This matched pair of Sylvania-MANUFACTURED

This lot of six RCA 6GH8A tubes tested to spec on our Paul Hart-calibrated TV7/U

where minimum (65%) is 40/40

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

Flashing Quality: good

All four tubes' diodes tested fine as well

The dust jacket is in nice condition

14 MM plates straddled by half-moons