RCA Cunningham Radiotron Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing Tray 9P I have played it in

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

This hardcover book is in very good condition and comes from a non-smoking household

This tube looks great

30 and 3o where minimum (65%) is 23

RCA Cunningham Radiotron Number / Type 48 #48 Vacuum Tube Engraved / Stamped Base NOS-Testing Tray 9P I have played it inThis 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