RCA Cunningham Number / Type 85 #85 Engraved / Stamped Base Vacuum Tube Valve NOS-Testing Handel May 18 2020 new in box Sylvania 1X2

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

Transconductance measured 41/42 where minimum (65%) is 21

Is it a Mullard

They were dead quiet when the preamp was muted and had excellent frequency response

This tube has nice silkscreening

RCA Cunningham Number / Type 85 #85 Engraved / Stamped Base Vacuum Tube Valve NOS-Testing Handel May 18 2020 new in box Sylvania 1X2This new old stock testing RCA Cunningham engraved base type 85 tube was tested on our Paul Hart calibrated TV7 U for shorts, gas, emissions and transconductance. There were no shorts or gas. It measured 45 in its triode section where minimum (65%) is 25 and 100% is 39. The diodes measured 56 and 56, respectively, where minimum (65%) is 40 40 and 100% is 61 61. IN 2021 WE PURCHASED 150,000 VACUUM TUBES. IF IT'S NOT LISTED, WE PROBABLY HAVE IT. PLEASE