Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing October 17 2025 new in box 1X2 tubes

new in box 1X2 tubes tested to spec on our Paul Hart-calibrated TV7/U

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

These three US-made milspec VR-150 / VT-139 / 0D3A tubes tested to spec in our Hickok 800

These seven new old stock

It sounds very good with light surface noise and the occasional click and pop

Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing October 17 2025 new in box 1X2 tubesThis 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