6B4G Raytheon NOS 1950 era, separate parallel plates, in WB

94mA

Gm=6200

(6B4G=6.3V filament)

(6B4G is electrically equivalent to 6A3, but 6A3 has UX-4 pin base and 6B4G has 8 pin octal base)

(The best sounding 6B4G are 1940”s-1950”s: Ken Rad, Tungsol, Sylvania, Raytheon)