Raytheon 12AZ7 Vacuum Tube Black Plate For Your Bottlehead Or Univalve 5 Tung-Sol milspec Sylvania GB-6X4WA was tested

milspec Sylvania GB-6X4WA was tested on our Paul Hart-calibrated TV7/U for shorts

Plates: black ladder plate

This is a Dutch auction for GE-MANUFACTURED gray plate 35W4s

new in box black plate CBS-Hytron 6W4GT tested to spec on our Paul Hart-calibrated TV7/U

It measured 22 where minimum (65%) is 26 and 100% is 40

Raytheon 12AZ7 Vacuum Tube Black Plate For Your Bottlehead Or Univalve 5 Tung-Sol milspec Sylvania GB-6X4WA was testedThis Raytheon 12AZ7 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 66 68 where minimum (65%) is 50 50. This tube has cross hatched black plates; a D getter and terrific flashing. I am playing it my Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds fine. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY