Sylvania 12AV7 Vacuum Tube NOS NIB Black Plate For Your Bottlehead Juan Rosenkavalier These six new old stock

These six new old stock

IF IT'S NOT LISTED

They measured 86/82

(New US-made 7408s typically test with plate current from the mid-teens to mid-30s with transconductance from 2300 micromhos or so

This hardcover book is in very good condition

Sylvania 12AV7 Vacuum Tube NOS NIB Black Plate For Your Bottlehead Juan Rosenkavalier These six new old stockThis new old stock, new in box Sylvania 12AV7 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 41 42 where minimum (65%) is 21. This tube has black plates; an O getter; terrific flashing and GJ MVWV date codes. I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds fine. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES.