Matched Pair RCA Radiotron Number / Type 89 #89 Vacuum Tubes NOS-Testing 6B8 Grid Cap Tube Three (triode): 51

Tube Three (triode): 51

Tube One drew 26

a third mica spacer for increased vibration resistance and lowered microphonics

I am playing them in my Bottlehead Crack headphone amplifier as I write

new in box Italian Sylvania 12SN7GTA dual triode was tested on our Hickok 600A for shorts

Matched Pair RCA Radiotron Number / Type 89 #89 Vacuum Tubes NOS-Testing 6B8 Grid Cap Tube Three (triode): 51This matched pair of RCA Radiotron number 89 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They tested as follows: 56 and 58 where minimum (65%) is 395 and 100% is 60. These are great looking, well constructed tubes with Micanol bases; anode radiators for cooler operation and longer tube life and gray and silver bottles. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT