HL/DD/1320 @ The Valve Museum

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HL/DD/1320

Sensibly equivalent^¶ to:

11D3 13DHA CV3503 HAD TDD13C

Extras ▼

Mazda Photographic Donation - Mark Mallison

The HLDD1320 is an indirectly heated double diode triode. The intended use was in universal (AC or DC mains) receivers including car radios. The envelope is screened and within the glass so is the diode section.

An alternative data-sheet can be found here.

B7 base.

Thanks to Mark Mallison for sending the images.

The classic envelope is mm in diameter and, excluding the B7 base pins, is mm tall.

References: Data-sheet & ¹⁰⁴³. Type HL/DD/1320 was first introduced in 1934. See also 1934 adverts.

Pin Connections

B7	1	2	3	4	5	6	7	tc
	a(d2)	m	a(d1)	h	h	k	a	g1

Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	13.0	0.2	200	-3.0	4.3	15,00	2.0

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated April 16, 2022.

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