Sylvania 12AV7 Vacuum Tube Black Plate NOS-Testing Sylvania NOS-Testing perforated plates
$10.88
Description
perforated plates
new in box Amperex 3A2 tubes tested to spec on our Paul Hart-calibrated TV7/U
new in box RCA RCA 3AT2 / 3AT2B / 3AW2 tubes tested to spec on our Paul Hart-calibrated TV7/U
Tube One measured 1940 micromhos
Sylvania 12AV7 Vacuum Tube Black Plate NOS-Testing Sylvania NOS-Testing perforated platesThis new old stock testing Sylvania 12AV7 dual triode was tested on our Jackson for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 116% 104% where minimum (65%) is 70% 70%. This tube has black plates; a horseshoe getter and terrific flashing. I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds excellent. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE
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