5840 @ The Valve Museum

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5840

Sensibly equivalent^¶ to:

CV3929 EF732

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Mullard The John Lawrence Collection

The 5840 is the special quality version of the EF732 pentode. It appears to be an updated version of the EF72.

The 5840 was designed for wide band HF amplification under adverse conditions where good reliability is required. These applications include military equipment and industrial applications. As it will maintain its emission when used with long periods operating at cut-off, application in computer circuits are a possible use.

Another application area is as a microphone pre-amplifier built into condenser microphones.

The thin glass tube envelope is 9 mm in diameter and, excluding the B8D base wires, is 36 mm tall.

References: Data-sheet & ³⁰⁰². Type 5840 was first introduced in 1957. See also 1957 adverts.

Pin Connections

B8D & B8D/F	1	2	3	4	5	6	7	8
	g1	k,g3	h	k,g3	a	h	g2	k,g3

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.15	100	100	-1	7.5	2.4	0.26M	5

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 31, 2013.

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