The UCL82 triode pentode was designed for single ended audio output stages in universal mains domestic equipment, normally radios. In this application the output of 3 Watts was more than adequate for most rooms. For television use, with more valves in the chain, the 300 mA version the PCL82 would have been appropriate. The standard for AC mains sets using a mains transformer would have been the ECL82.

The triode is on the left of the image. The output pentode is the larger unit on the right.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.

References: Datasheet, ³⁰⁰² & ¹⁰⁴⁰. Type UCL82 was first introduced^¶ in 1956.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g1(t)	k,G3,S	g1	h	h	a	g2	k(t)	a(t)

 
Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pdiss	Pout	D
	50	0.1	250	250	-22.5	28	5.5	25,000	5.0	7.0W	3.4W	10%

Thanks to Frank Philipse for supplying the above PDF datasheet

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