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 unbranded valve is included as the envelope is clear making the inner detail accessible.
The triode with internal screen behind.
The triode on the left with the much larger pentode on the right.
The end wall of the pentode showing the suppressor grid support.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
References: Data-sheet, 3002 & 1040. Type PCF802 was first introduced in 1962. See also1962 adverts.
