The PCL82 triode pentode is typical of the later 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. Today (2003) we take for granted that the picture tube will last eight to ten years of daily use.

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.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	gt	kp,g3,s	g1	h	h	ap	g2	kt	at

 
Absolute Maximum Operating Conditions

Pentode

Vh

Ah

Va

Vs

Vg

mAa

mAs

ra

gm

Pdiss

Pout

D

16

0.3

170

170

-11.5

41

7.5

16k

7.5

7.0W

3.3W

10%

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 10 June 2007 {find valves by name}