Sylvania 12AV7 Vacuum Tube Valve Black Plate NOS-Testing 17BZ3 T18 This RCA Radiotron number /

This RCA Radiotron number / type 80 rectifier tube was tested on our Paul Hart-calibrated TV7/U

I am playing them in one of my Radio Craftsmen SC-2 monoblocks as I write

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This Moss Music Group DBX pressing has no surface noise but a very few pops and ticks

Sylvania 12AV7 Vacuum Tube Valve Black Plate NOS-Testing 17BZ3 T18 This RCA Radiotron number /This 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