4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis Tube One measured 57/63 while

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

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

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

Tube One measured 54 while Tube Two also measured 54

4 US-Made 7B7 Vacuum Tubes Lot Of Four Steven Curtis Tube One measured 57/63 whileThis 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