Sylvania 12AV7 Vacuum Tube NOS NIB Black Plate For Your Bottlehead Juan Rosenkavalier PLEASE BE PATIENT FOR THE

PLEASE BE PATIENT FOR THE FIRST DAY OR TWO IF THE PACKAGE IS STILL MARKED AS "PRE-TRANSIT

straight-bottle bottle variety

This hardcover book is in very good condition

WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES

They have engraved / hot-stamped bases on is Champion-branded and the other is Zenith

Sylvania 12AV7 Vacuum Tube NOS NIB Black Plate For Your Bottlehead Juan Rosenkavalier PLEASE BE PATIENT FOR THEThis 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.