1 pair) 6BX7GT GE branded Tungsol black plate "D" getter NOS 1957 

1 tube) 53/57ma Gm=9200/9300 (in white box, original box is rotted)

1 tube) 48/53ma Gm=8200/8300 original box

Good Ma range 38-45ma

Good Gm range = 7000-7500

Recommended for

- Single Power

(Vfil=6.3V @ 1.5A, Vplate max=500V, Iplate max=60ma, Pout max = 12 watts total for both triode sides)
Typical Characteristics Class A Amp:
Vplate= 250V
Iplate= 42ma
Vgrid=
Rp= 1300 ohms
Mu= 10
Gm= 7600 mhos