RCA Cunningham Radiotron Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing Tray 9P new in box US-made number

new in box US-made number / type 89 tubes tested to spec on our Paul Hart-calibrated TV7/U

not included) and they sound excellent

I have played it in my Schiit Vali 2 headphone amplifier and it sounds outstanding

This is a Dutch auction for Sylvania 35W4s

RCA Cunningham Radiotron Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing Tray 9P new in box US-made numberThis new old stock testing RCA Cunningham Radiotron 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 120 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