Sensibly equivalent¶ to:
The PCL82 triode pentode is typical of valve television receivers audio output stages.
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. By the end of the 20th century it was taken for granted that the picture tube would last eight to ten years of daily use.
See also 30PL13 and 30PL14 frame output valves.
An audio amplifier similar to those employed in early 1960's television receivers. The input would be obtained from the volume control and a suitable triode-pentode would be the PCL82. The 3.3MΩ resistor between anodes provides negative feedback.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins it is 68 mm tall.
References: Datasheet & 1040. Type PCL82 was first introduced in 1955.
Absolute Maximum Operating Conditions¶
Updated February 28, 2014.