485 National Union used/good 1940”s (6.2ma)

485 National Union used/good 1940”s

6.2ma

Gm=1200

NOS Ma = 5.8ma

NOS Ma = 1400-1500

(variant of Type 27 with 3V @ 1.25A filament)
(Sparton=The Sparks-Withington Co., Jackson, MI)