4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis new in box Sylvania 6BX7GT

new in box Sylvania 6BX7GT tube tested to spec on our Paul Hart-calibrated TV7

new in box Sylvania 5BC3 tested to spec on our Paul Hart-calibrated TV7/U

Tube One measured 57/63 while Tube Two measured 60/61 where minimum (65%) is 38/38 and 100% is 58/58

They have tall bases

4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis new in box Sylvania 6BX7GTThis lot of four US made 7B7 tubes was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 41, 42, 44 and 47, respectively, where (65%) is 43 and 100% is 66. They have mica snubbers for increased vibration resistance and lowered microphonics and great flashing. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER