(!!!) (Recommended Pair) 713A Western Electric by Tungsol NOS 1942-1943 (6.6ma and 6.9ma) (713A = 717A with black base)

1 pair) 713A Western Electric by Tungsol NOS 1942-1943
1 tube) 6.6ma Gm=3300
1 tube) 6.9ma Gm=3100 glass bulges out on one side / imperfect glass bulb / odd-shape

- 713A=717A with black bakelite base

- pins cleaned on both tubes

Vplate=100V

Vscreen=100V

Vgrid=-1V

Good Ma 5.5-8ma

Good Gm 3000-4000

- Pentode

most made by Tungsol branded Tungsol or Western Electric by Tungsol

- Yamamoto AO8 amp