(!!!!) (BEST PAIR) 309A Western Electric NOS 1960 (4.8ma and 5.1ma) (same Gm)

1 matched pair) 309A Western Electric NOS 1960 original boxes - large punch plate

1 tube) 4.8ma Gm=1100

1 tube) 5.1ma Gm=1100

Matched on Amplitrex

Vplate=180V

Vscreen=75V

Vgrid=-1.5V

Good Ma = 4.5-4.8ma

Good Gm = 1000-1100

General Info

- Variable-Mu Pentode

- Very low noise

- 5 pin base

Vfil=10V @ 320ma

Vplate=180V

Gm=1100