X17 @ The Valve Museum

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X17

Sensibly equivalent^¶ to:

1C1 1R5 CV782 DK91 VT-171

See also:

Osram Miniature Valves Advert

Extras ▼

Marconi Brian Middleton Valve Gift Other X17 exhibits

The X17 is a miniature heptode frequency changer and was designed for dry battery operation.

Miniature valves using B7G bases was a post war development in the UK following the influence on the industry of American designs and technology.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.

References: Data-sheet & ³⁰⁰². Type X17 was first introduced in 1947. See also 1947 adverts.

Pin Connections

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

Absolute Maximum Operating Conditions^¶

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	1.4	0.05	90	45	-0	0.8	1.9	0.8M	0.25

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 27, 2013.

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