(!) (Pair) 404A Western Electric used/good 1963-1969 (16.5ma and 17.6ma)

1 matched pair) 404A Western Electric used/good

1 tube) 16.5ma Gm=13,800 (1963)

1 tube) 17.6ma Gm=14,400 (1969)

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