1R5 @ The Valve Museum

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1R5

Sensibly equivalent^¶ to:

1C1 CV782 DK91 X17

See also:

The 'Rambler' Portable Superhet

Extras ▼

RCA The John Lawrence Collection Other 1R5 exhibits

The 1R5 miniature heptode frequency changer was designed for dry battery operation. The exhibit is in the original box that is marked JRC1R5 US Army May 1945. UK production of B7G based valves started a couple of years later than in the USA.

The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 46 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type 1R5 was first introduced in 1940. See also 1940 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 March 12, 2022.

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