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309A Western Electric NOS 1960 (1 pair: 4.8ma and 5.1ma) (matched on Amplitrex)

$ 199.99

1 matched pair) 309A Western Electric NOS 1960 original boxes

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

 

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