The EL84 output pentode was introduced by Mullard in 1954 and has been made and sold by many others as it is one of the standard audio output valves.

This exhibit is an ebay find complete with the Phab box.

The side view with the grid supports showing. This valve looks very much like a re-badge Mullard product.

The base showing the tape connections between the base assembly and the jig formed electrodes.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 70 mm tall.

References: Datasheet & ¹⁰⁴⁵ Type EL84 was first introduced^¶ in 1953.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	ic	g1	k,g3	h	h	ic	a	ic	g2

 
Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm	Pout	Pdiss
	6.3	0.76	250	250	-7.3	48	5.5	6.7	2.2	12W

Thanks to Frank Philipse for supplying the above PDF datasheet

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