The DK96 dry battery frequency changer from Mullard is from the later range of very low filament consumption valves. This example is British made. Later DK96 valves were imported. These 25 mA filament valves, introduced in the 1950s, were designed for use in battery portable domestic radio receivers. This type of radio was killed stone dead by the transistor in the early 1960s.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	f-	a	g2	g1	g4	g3	f+,g5

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	1.4	0.025	85	68	0	0.6	0.14	0.8M	0.3

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 06 July 2007 {find valves by name}