EF12 @ The Valve Museum

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EF12

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Valvo The Two Margarets Other EF12 exhibits

The EF12 is a pentode designed for RF or IF amplification at HF or MF. Also the data-sheet gives details for its use as an AF amplifier.

The footless construction uses a glass disc rather than a pinch.

The shaped pins of the footless base.

The base with spigot and locating ridge.

The wide metal tube envelope is 36 mm in diameter, and excluding the footless base pins is 35 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type EF12 was first introduced in 1939. See also 1939 adverts.

Pin Connections

Footless	1	2	3	4	5	6	7	8
	g2	g1	k,g3,m	nc	h	h	nc	a

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	μ
	6.3	0.2	250	100	-2	3.0	1.0	2M	2.1	25.0

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated December13, 2022.

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