The VT-93 American metal valve is a double diode pentode and the VT-93 is a government procurement designation. Such valves were made for the signal detector, AGC detector and first audio amplifier stages of superhet receivers. The commercial Type designation is 6B8.
The 6B8 designation. Unlike the UK, the US government tended to use standard types for projects.
The Ken-Rad name.
The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 63 mm tall.
References: Data-sheet & 1040. Type VT-93 was first introduced in 1937. See also1937 adverts.
