6CK5 @ The Valve Museum

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6CK5

Sensibly equivalent^¶ to:

67PT CV3889 EL41 N150

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Tungsram G8LSD Valve Collection

The 6CK5 is an early design for an all glass output pentode rated for 9 watts anode dissipation, and intended primarily for use in AC mains operated equipment and to be used with self-bias or semi-automatic bias only.

The 6CK5 is identical to the EL41.

This valve has a wider base to the envelope and a locating pip moulded into the glass.

The thin glass tube envelope is 21 mm in diameter and, excluding the B8A base pins, is 68 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 6CK5 was first introduced in 1947. See also 1947 adverts.

Pin Connections

B8A	1	2	3	4	5	6	7	8
	h	a	k	k,g3	g2	g1	k	h

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pdiss	Pout	D
	6.3	0.7	250	250	-7	36	5.2	40,000	10	9W	4.2W	10%

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated April 12, 2013.

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