CV782 @ The Valve Museum

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CV782

Sensibly equivalent^¶ to:

1C1 1R5 DK91 X17

Extras ▼

Unknown G8LSD Valve Collection

The CV782 and its commercial twin, the 1R5, are miniature heptode frequency changers. The valve design was for dry battery operation.

The tension spring for the single strand oxide coated filament can be seen at the top.

The two screen grids are strapped together at the top of their supports.

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

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type CV782 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 March 27, 2021.

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