Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing October 17 2025 This quintet of Tung-Sol number

This quintet of Tung-Sol number / type 27 triodes was tested on our TV7 for shorts

It is also autographed by Mr

This lot of nine new old stock

excellent flashing and super-shiny pins

SOMETIMES THERE ARE INITIAL SCANNING DELAYS

Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing October 17 2025 This quintet of Tung-Sol numberThis 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