Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing KSBS 2034 rectangular top mica spacer and

rectangular top mica spacer and a smooth

3 milliamps' plate current and measured 2090 micromhos while Tube Two measured 23/2130 where new 6F6s measure from approximately 2000 micromhos with plate current draw in the 20s

I am playing them as I write in my Alan Eaton AC-heated single-ended 45 amplifier with Pink Floyd’s "The Wall" as 6SN7 substitutes and they sound terrific

new in box Sylvania-MANUFACTURED

Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing KSBS 2034 rectangular top mica spacer andThis 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