Raytheon 12AZ7 Vacuum Tube Black Plate For Your Bottlehead Or Univalve 5 Tung-Sol This is a Dutch auction

This is a Dutch auction for GE-MANUFACTURED gray plate 35W4s

Plates: black ladder plate

This new old stock-testing matched pair of RCA Radiotron 805 output triodes was tested on our Paul Hart-calibrated TV7/U with 180 volts on the plates and a bias of 0 volts for shorts

This new old stock-testing RCA 6CG7 / 6FQ7 dual triode tested a perfectly-balanced 2600/2600 micromhos on our Hickok 800

Raytheon 12AZ7 Vacuum Tube Black Plate For Your Bottlehead Or Univalve 5 Tung-Sol This is a Dutch auctionThis Raytheon 12AZ7 dual triode was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 66 68 where minimum (65%) is 50 50. This tube has cross hatched black plates; a D getter and terrific flashing. I am playing it my Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds fine. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY