(!!!) (#1 12AX7=ECC803S SINGLE) ECC803S=12AX7 Telefunken Germany <> bottom NOS 1968 1% section balance (Gm=1750/1800) (1.6/1.6ma) (Highest Ma and Gm)
(!!) (#2 12AX7=ECC803S SINGLE) ECC803S=12AX7 Telefunken Germany <> bottom NOS 1965 1% section balance (Gm=1650/1650) (1.1/1.1ma)
