Sylvania Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or Bottlehead October 07 2023 Transconductance measured 62 for Tube

Transconductance measured 62 for Tube One and 64 for Tube Two where minimum (65%) is 40

67 and 74 where minimum (65%) is 53

These tubes have steel support rods and top

There are two GEs

Sylvania Black Plate 12BZ7 Vacuum Tube NOS NIB For Your Univalve Or Bottlehead October 07 2023 Transconductance measured 62 for TubeThis new old stock, new in box Sylvania 12BZ7 tube tested to spec on our TV7 U. It measured 25 23 where minimum (65%) is 18 18 and 100% is 28 28. It has black plates; an O getter; steel support rods and outstanding flashing. I have listened to it in my Bottlehead Crack headphone amplifier and it sounded great. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL