(!) (Pair) 404A Western Electric used/good 1963-1966 (17.0ma and 17.2ma)

1 matched pair) 404A Western Electric used/good

1 tube) 17.2ma Gm=12,000 (1963)

1 tube) 17.0ma Gm=11,600 (1966)

Tested on Amplitrex

Vplate=150V

Vscreen=150V

Vgrid=-1.5V

Good like new Ma range 18-20ma

Good used Gm range 12,000 – 13,000