4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis Tube One measured 1930 micromhos

Tube One measured 1930 micromhos

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

They measured 85/66 for Tube One and 85/70 for Tube Two where minimum (65%) is 57/57 and 100% is 88/88

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

9 milliamps with a transconductance of 2390 micromhos while Tube Two measured 21

4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis Tube One measured 1930 micromhosThis 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