This is a very nice set of 4 Amperex Bugle Boy 12AU7 ECC82 tubes. They were removed from an Ampex deck with very little use, and are about as close to NOS as possible.
They have very nice lettering. They have matched codes of K64 (the first digit is a symbol that resembles a K) over "triangle/delta symbol" 81. You should be able to see the codes in the picture.
Tested on my Hickok, they read between 2400 & 2500 on all sections, right where new tf's normally read.
Insured Priority mail will be $7.00 Domestic, $18.00 international.