The VX3519 is the prototype for the CV4081. This triode was built for reliability and has flying leads for direct soldering into radio equipment. The main applications were probably military. Vibration and shock resistance were significant considerations.
The GEC label. The GEC brand was used on M-OV valves for professional applications.
The original box.
Thanks to Mark Mallison for sending the images.
The thin glass tube envelope is mm in diameter and, excluding the footless base pins, is mm tall.
Reference: Data-sheet. Type VX3519 was first introduced in 1959. See also1959 adverts.
