01A National Union NOS 1940”s (3.1ma)

1 tube) 01A Nat. Union NOS original box (3.1ma Gm=750)

Tested on Amplitrex

Good Ma = 3ma

Good Gm = 700-800

(Filament=5V @ 250ma, Vplate max=135V)

– Crosley C5 1926