6F6G National Union black plate NOS 1951

40.5ma

Gm=2500

Test settings:

Vplate=285V

Vscreen=285V

Vgrid=-20V

Good Ma range = 32-38ma

Good Gm range = 2400-2600

Recommended for

– Sparton Nocturne 1186 from 1936

– Fire Stone Sir Chef S-7404-3 1939

– Montgomery-Ward Airline Model 62-226

– Supratek Cortese

– Victoria

– WE 106 preamp clone

– Wards Airline Radio