(!!) (Best Overall Single) 7247=12DW7 GE branded RCA NOS pinched plates 1970 (1.2ma and 14.5ma) (Highest Ma and Gm)

7247=12DW7 GE branded RCA NOS pinched plates 1970

12AX7 Section = 1.2ma Gm=1800

12AU7 Section = 14.5ma Gm=2400

Tested on Amplitrex

12AX7 Section NOS Good = 1-1.2ma Gm=1500-1600

12AU7 Section NOS Good = 8-10ma Gm=1800-2200