5868 // TB4/1250 – radiation-cooled power glass envelope triode with anode dissipation power 450 W.

The 5868  transmitting tube  is a medium-mu power triode intended for use in RF amplifier, oscillator, or class B modulator service. The 5868 features rugged construction for high power RF transmitter applications. The envelope is fabricated from hard glass intended specifically for the high-temperature operation of transmitting tubes.
The internal tube parts are supported by low loss ceramic insulators for high-temperature operation and high voltage hold-off. The rugged grid structure is particularly well suited for industrial heating applications.