Sylvania Black Plate 12BZ7 Vacuum Tube Valve NOS NIB For Your Univalve Or Bottlehead Opus 1 3 10 12 please select “6” from the

please select “6” from the quantity box

210 5213 and no provenance/date codes

(New 12AU7s typically test within one standard deviation of 2200 micromhos

new in box GE 6AL7GT tubes tested to spec on our TV7

Sylvania Black Plate 12BZ7 Vacuum Tube Valve NOS NIB For Your Univalve Or Bottlehead Opus 1 3 10 12 please select “6” from theThis 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