The VT-132 is the American designation of the 12K8 frequency changer. The design was as a purpose designed frequency changer. See also6K8 that has a diagram of the special construction.
The local oscillator would produce 7.5 Volts peak to peak signal from the triode section.
The Ken-Rad name and Made in USA.
The commercial Type designation of 12K8.
The top cap insulation sealed to the steel envelope. Not the easiest of production tasks.
The original plain card box for this utility valve and that this was made for the US Army.
This label shows that the valve was supplied to the UK War effort - probably under the lend-lease scheme.
The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 62 mm tall.
