National Union NU 6F6 6F6G Vacuum Tube ST Shoulder Shape NOS-Testing 12AX7 Enhanced Cooling: yes

Enhanced Cooling: yes

The dust jacket is in excellent condition

They measured 29 and 31 where minimum (65%) is 22 and 100% is 40

75-6 out of ten

nicely-matched pair of General Electric 12AU7/ECC82 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

National Union NU 6F6 6F6G Vacuum Tube ST Shoulder Shape NOS-Testing 12AX7 Enhanced Cooling: yesThis NOS testing National Union 6F6G output tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 76 where minimum (65%) is 50 and 100% is 77. 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 ANY QUESTIONS. 1. MOST