Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing KSBS 2034 they measured 59

they measured 59

Top: crenelated

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

Test results to follow

rectangular top mica spacer and a smooth

Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing KSBS 2034 they measured 59This 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