The PCF802 was designed as the first stages in television line frequency generation prior to the line output stage. The pentode is described by Mullard as the oscillator while the triode is for service as a reactance valve. This suggests the triode acting as a frequency controlling stage.
This exhibit features the stylised M logo and valve is labelled as the neutral imported rather than the old pejorative foreign.
The triode on the right has its grid axis at right angles to that of the pentode.
The pentode section: the holes in the anode reveal the suppressor grid support. The control grid has copper supports and there is an intersection screen in the background.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
References: Data-sheet, Data, 3002 & 1040. Type PCF802 was first introduced in 1962. See also1962 adverts.
