This matched pair of new old stock-testing, new in box CBS 12SN7GT vacuum tubes was tested on our TV-7/U.  Tubes measured:

Tube One:  80 / 80 (CBS stenciled on base with code LA; 12SN7GT with CR code atop glass)
Tube Two:  80 / 82 (CBS stenciled on base with code LA; 12SN7GT with CR code atop glass)

Minimum is 50 (65%); NOS is between 68 (90%) and 75+ (100%).  Tube One tests 107% / 107% and Tube Two tests 107% / 109%.

Listened to pair in our Alan Eaton amplifier; are dead quiet when the amps are muted; and have excellent frequency response, sound-staging, presence and 
dynamics (see pics).  Pair have black T plates, single bottom D double bar getter with same base and glass codes.  Tight on bases with no debris or rattling sounds.

Check out my store for more tubes for your equipment needs.

Tubes ship via United States Postal Service (USPS) Ground Advantage with tracking for domestic U.S. sale; Priority is an option.  International orders ship via USPS First Class Mail International.  Package weighs eight (8) ounces.

Combined shipping always welcomed.

TUBES ARE GUARANTEED GOOD AND IN WORKING ORDER AT SHIPMENT. TRANSIT VIA POST CAN DAMAGE TUBES.  THIS IS NO FAULT OF OURS BUT THE 

THIRD PARTY ENTITY THAT IS DELIVERING ITEM(S) TO YOU, I.E, USPS, UPS, FEDEX, YOUR NATIONAL CARRIER IF INTERNATIONAL, ETC. PLEASE INSURE 

THEM! WE CANNOT GUARANTEE FAILURES ON YOUR EQUIPMENT AFTER POWER UP AS THERE IS NO WAY TO ASCERTAIN HOW TUBES WILL INTERACT WITH 

YOUR ELECTRONICS; NOR IS THERE A WAY TO DETERMINE WHETHER THEY MAY HAVE FATAL FLAWS IN TUBES THEMSELVES!  THESE ARE USED VACUUM 

TUBES AND TIME MAY HAVE TAKEN A TOLL ON THEM OVER THE MANY YEARS SINCE THEY WERE MANUFACTURED. WE CAN ONLY TEST FOR THE 

PARAMETERS MENTIONED ABOVE IN ONE OR MORE OF THE FOLLOWING EQUIPMENT WE USE FOR MEASURING:  TV-7/U, JACKSON 648 & MAXI MATCHER 2.