Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing October 17 2025 It sounds very good with

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

SOMETIMES THERE ARE INITIAL SCANNING DELAYS

This lot of four European PCL805 tubes was tested on our Paul Hart-calibrated TV7/U

This lot of nine new old stock

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

Sylvania Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing October 17 2025 It sounds very good withThis 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