Telefunken 6AQ8 ECC85 Vacuum Tube NOS-Testing Operetta In Hi-Fi 5 record cleaner and then

5 record cleaner and then played it on Rega Planar Three

Tube One Transconductance: 45/45

There is no transconductance reference reading on this tester

Tube One measured 60 while Tube Two measured 70 where minimum (65%) is 46 and 100% is 71

It has an engraved / stamped base

Telefunken 6AQ8 ECC85 Vacuum Tube NOS-Testing Operetta In Hi-Fi 5 record cleaner and thenThis new old stock TESTING Telefunken 6AQ8 ECC85 tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 83 84 where minimum (65%) is 50 50 and 100% is 77 77. I have played it in my Schiit Vali 2 headphone amp and it sounds great. It has a smooth top, steel support rods and a 28 backwards 7 code embossed within the Telefunken diamond (<>) in its base. WE HAVE SCORES OF THOUSANDS