The PCL82 triode pentode is a typical audio output and/or frame oscillator and output stage valve.
The double valve enabled the demodulated audio signal to be amplified and applied to the speaker by using the minimum number of components and printed circuit board space.
The chassis would have been a vertical printed circuit board with the gun of the picture tube passing through it. Each of the tall valves would have been retained in their holders by a spring clip.
For such receivers the valve technology had developed to the point that the valves would normally last the life of the set without needing to be replaced. Today (2003) we take for granted that the picture tube will last eight to ten years of daily use.
The triode anode face view.
The two separate electrode assemblies can be clearly seen. The triode is the small box on the right.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 70 mm tall.
References: Data-sheet & 1040. Type PCL82 was first introduced in 1955. See also1955 adverts.