56 RCA no name NOS 1940's made for Radiotelefonica Argentia (5.1ma)

56 RCA no name NOS 1940's made for Radiotelefonica Argentia in original box

5.1ma

Gm=1300

Tested on Amplitrex:

Vplate=250V

Vgrid=-13.5V

Iplate good range = 4.5-5.5ma

Gm=1400