Telefunken ECH81 Vacuum Tube Valve Hytron Triple 3 Mica Tube One measured 72/74 while

Tube One measured 72/74 while Tube Two (Zenith-LABELED) measured 74/73 where minimum (65%) is 50/50 and 100% is 77/77

This quad of Canadian-MANUFACTURED type 76 triodes was tested on our Paul Hart-calibrated TV7/U for shorts

These US-made 12SF7 tubes were tested on our Paul Hart-calibrated TV7 for shorts

Transconductance measured 74 for Tube One and 76 for Tube Two where minimum (65%) is 58

I have played it in my Alan Eaton singe-ended 45 amplifier (at 6

Telefunken ECH81 Vacuum Tube Valve Hytron Triple 3 Mica Tube One measured 72/74 whileThis Telefunken ECH81 6AJ6 was tested on our Paul Hart calibrated TV7 for shorts, gas and transconductance. There were no shorts or gas. It measured 70 59 where minimum (65%) is 50 50 and has the Telefunken diamond (<>) embossed in its base. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE