Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing KSBS 2034 striking at 75 where minimum

striking at 75 where minimum is 40

They tested (from left to right) as follows: 56 and 59 where minimum (65%) is 40

rectangular top mica spacer and a smooth

There were no shorts or gas and it measured as follows:

new in box Sylvania-MANUFACTURED

Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing KSBS 2034 striking at 75 where minimumThis new old stock testing Sylvania engraved base type 48 tube was tested our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 80 where minimum (65%) is 50 and 100% is 77. It has a sheet getter; an anode radiator for cooler operation and longer tube life and a banded cross top mica spacer. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY