Manufactured in the 1930's for the US military, this Western Electric WE249B tube has a 1930's has an engraved base and has a tested label adhered. In original box. $309.99
249B is similar to 866A. Vfil is 2.5V., whereas 866A is 3.0 Vfil.
Recommended for the following amps: D-6656 RTE, Navy D-97502 Rectifier, 14A Rectifier, 99A Amplifier, 100A Amplifier.