Sylvania 12AV7 Vacuum Tube NOS NIB Black Plate For Your Bottlehead Juan Rosenkavalier This new old stock-testing matched

This new old stock-testing matched pair of milspec RCA 1619 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

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This hardcover book is in very good condition

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Sylvania 12AV7 Vacuum Tube NOS NIB Black Plate For Your Bottlehead Juan Rosenkavalier This new old stock-testing matchedThis 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.