The 6EA8 is a triode pentode. The pentode is of the sharp cut-off type. The design purpose was as a triode oscillator and pentode mixer within VHF TV tuners.
The warm-up time is 11 seconds and this valve would usually be found in a series heater chain.
El-Menco is the trade name of IEC Servicemaster - a New York based distributor. The valve was made in the UK for them.
Last tested in 1982. Normally the evacuation tube is sealed off at the join with the main envelope, here some of the initial tube remains.
The triode on the right.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 48 mm tall.
Reference: Data-sheet. Type 6EA8 was first introduced in 1958. See also1958 adverts.
