1R5 @ The Valve Museum

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1R5

Sensibly equivalent^¶ to:

1C1 CV782 DK91 X17

See also:

Pentagrid Converters - Brimar 6BE6, 6BA6, 6AT6, 6AQ5 & 6X4 12BE6, 12BA6, 12AT6, 35L6GT, 35W4, 6AK6, 1S5, 1U5, 3S4, 3V4, 1R5 & 1T4 Advert - Brimar 1R5, 1S4, 1S5, 3S4, 1T4 & 3V4 Advert - The 'Rambler' Portable Superhet

Extras ▼

Brimar G8LSD Valve Collection Other 1R5 exhibits

The 1R5 is a frequency changer heptode for a battery portable broadcast radio receiver. The heptode or pentagrid structure has two control grids g1 & g3 with screen grids held at RF ground at g2 & g4. G5 is the suppressor grid.

The valve would be made to self oscillate, and the intermediate frequency would be extracted from the tuned anode circuit. The oscillator would probably be generating 15 Volts peak to peak.

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 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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