(!!!) (Best Pair) 713A Western Electric by Tungsol NOS 1942-1943 (7.1ma and 7.0ma) (713A=717A with black base)

1 pair) 713A Western Electric by Tungsol NOS 1942-1943
1 tube) 7.0ma Gm=4000 (CTL-713A)
1 tube) 7.1ma Gm=3700 (713A)

Tested on Amplitrex

Good mA range 5.5-8mA

Good Gm range 3000-4000

(Pentode, 713A=717A with black bakelite base)
most made by Tungsol branded Tungsol or Western Electric by Tungsol

- Yamamoto AO8 amp