This exhibit is a Soviet era equivalent of the EL84 the type is given in Cyrillic as 6Л14Л/К.
The EL84 output pentode was introduced by Mullard in 1954. To demonstrate its use and quality the Mullard applications lab produced an amplifier design.
The markings on the glass with some enhancement.
The stitched anode and glass discolouration showing a well used valve.
Under the top mica can be seen the three wire grids.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 71 mm tall.
References: Data-sheet & 1040. Type 6P14P was first introduced in 1958. See also1958 adverts.
