Matched Pair RCA Clear Top 12HG7 12BY7 Vacuum Tubes NOS-Testing October 13 2024 It has black plates

It has black plates

58 and 60 where minimum (65%) is 42

The spine is in fine shape with no loose pages and there is a rip in the cover towards the top

This new old stock-testing matched pair of milspec/industrial Tung-Sol 6098 / 6AR6WA output tubes was tested on Paul Hart-calibrated TV7/U for shorts

new in box Zenith 17AY3 / 17AY3A / 17BS3 / 17BS3A tubes tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair RCA Clear Top 12HG7 12BY7 Vacuum Tubes NOS-Testing October 13 2024 It has black platesThis new old stock testing matched pair of RCA clear top 12HG7 tubes was tested on our Paul Hart calibrated TV7 U (on the 12BY7 setting) for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 80 while Tube Two measured 82 where minimum (65%) is 46 and 100% is 71. These tubes have anode radiators for cooler operation and longer tube life; side O getters and excellent flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES.