Sylvania 6BK7 6BK7A Vacuum Tube NOS NIB For Your Schiit 4BQ7A NOS NIB

Sylvania 6BK7 6BK7A Vacuum Tube NOS NIB For Your Schiit 4BQ7A NOS NIBThis new old stock, new in box black plate Sylvania 6BK7A tube tested to spec on our Paul Hart calibrated TV7 U. I have played it in my Schiit Audio Vali 2 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 OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST FORMS OF SHIPPING

new in box GE 6AD10 tube tested to spec on our Paul Hart-calibrated TV7/U

Its diodes measured 54 and 42

new in box quad of US-made 6G6G tubes tested to spec on our Paul Hart-calibrated TV7/U

45 and 48 where minimum is (65%) is 36 and 100% is 55

new in box RCA 6ME8 tubes tested to spec on our Paul Hart-calibrated TV7/U

These tubes have crenelated rectangular mica spacers

These tubes have pretty black bottles that entirely cover the top half of the tubes

A 7 out of ten

but that was the fashion back in the 1940s

34/34 and 38/41 where minimum (65%) is 25/25 and 100% is 38/38

102/83 and 102/86

Tube One measured 74 while Tube Two measured 78 where minimum (65%) is 46 and 100% is 71