EF85 @ The Valve Museum

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EF85

Sensibly equivalent^¶ to:

6BY7 6F19 6F26 CV1375 W719

Extras ▼

Unknown The Hampshire Collection Other EF85 exhibits

The EF85 is described as a VHF varible-mu pentode. Clearly this places the valve in a superhet context with AGC applied to the RF and IF sections. It was a television valve and the frame grid EF183, released in 1962, overtook its performance.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 60 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type EF85 was first introduced in 1951. See also 1951 adverts.

Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	k	g1	k	h	h	s	a	g2	g3

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	100	-2.0	10.0	2.5	0.5M	6.0

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated February 23, 2013.

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