328A Western Electric “”small punch”” NOS 1953 (5.5ma)

328A Western Electric “”small punch”” NOS 1953

5.5ma

Gm=1800

Tested on Amplitrex

Vplate=250V

Vscreen=135V

Vgrid=-3V

Good Ma = 5.3-5.8ma

Good Gm = 1700-1800