Sylvania 12AV7 Vacuum Tube Black Plate NOS-Testing

Sylvania 12AV7 Vacuum Tube Black Plate NOS-TestingThis 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

Limburg Province

I am playing it in my Musical Paradise MC-3 single-ended integrated amplifier with Badfinger's seminal "No Dice" album and they sound terrific

They have 312 EIA codes

This matched pair of Raytheon black glass 6V6GT output tubes was tested on our Maxi-Matcher 2 at real operating voltages of 400 volts on the plates and a bias of -36 volts for shorts

a slant D getter

The dust jacket is excellent shape

53/53 and 53/54 where minimum (65%) is 40/40

Tube One measured 31 while Tube Two measured 33 where minimum (65%) is 22 and 100% is 34

new in box Sylvania 7Y4 tubes in this lot

new in box RCA 12BQ6 / 12BQ6GTB / 12CU6 tube tested to spec on our Paul Hart-calibrated TV7/U

not included) in my AC-heated Radio Craftsmen RC-2 mono block amplifiers and they sound great

This Arcturus type 76 triode was tested on our Paul Hart-calibrated TV7/U for shorts