DM70 @ The Valve Museum

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DM70

Sensibly equivalent^¶ to:

1M1 1M3 CV2980 Y25

See also:

Mullard DM70 Advert - Mullard DM70 contd. Advert

Extras ▼

Mullard Photographic Donations Other DM70 exhibits

The DM70 is a miniature tuning indicator designed for dry battery operation. This exhibit was made in Holland by Philips.

The DM70 introduced in 1952 was one of the first miniature devices produced by Mullard.

The display changes from minimum to maximum for a 10 Volt change on the control grid. The discharge channel is tapered and the glowing column will travel further along as the voltage is altered. See DM70 for a diagram.

Thanks to John Sykes for sending the photographs.

The thin glass tube envelope is 9 mm in diameter and, excluding the B8D base pins is 43 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type DM70 was first introduced in 1952. See also 1952 adverts.

Pin Connections

B8D & B8D/F	1	2	3	4	5	6	7	8
	g1	ic	nc	f	f	nc	nc	a

Absolute Maximum Operating Conditions^¶

CRT	Vh	Ah	Va	mAa
	1.4	0.025	85	0.17

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 04, 2022.

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