TWO 6072 SYLVANIA TUBES (12AX7 UPGRADE) 17MM GREY PLATE NOS

Low-noise, low-microphonic miniature twin triode designed primarily for use in the low-level stages of high-gain audio-frequency amplifiers.

17mm long grey plates, new in box.
Date codes are the same: "LM SAO".

Tests with Gm above specifications.  (Hickok 750 tester.)