Sylvania 12AV7 Vacuum Tube Valve Black Plate NOS-Testing 17BZ3 T18 This Moss Music Group DBX

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

new in box RCA 36MC6 / 36MC6A tubes tested to spec on our Paul Hart-calibrated TV7/U

a round mica spacers and gray plates

new in box Telefunken 6BL8 / ECF80 tube tested to spec on our Paul Hart-calibrated TV7/U

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

Sylvania 12AV7 Vacuum Tube Valve Black Plate NOS-Testing 17BZ3 T18 This Moss Music Group DBXThis 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