CV2901 @ The Valve Museum

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CV2901

Sensibly equivalent^¶ to:

6267 CV4085 EF86

See also:

Mullard's EF86 - A Low Cost Amplifier

Extras ▼

Mullard G8LSD Valve Collection Other CV2901 exhibits

The CV2901 is the UK service designation for the low noise audio amplifier pentode EF86 (Mullard) or Z729 (M-OV). The EF86 design is anti-microphonic. In use it is recommended that it is fitted into a vibration resistant base formed by isolated the base from the metal skirt by a synthetic rubber mount.

The KB/D identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the D identifies the maker as Mullard Radio Valve Co., Blackburn.

See also CV4086 for the flying lead version.

The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 48 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV2901 was first introduced in 1954. See also 1954 adverts.

Pin Connections

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

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.2	250	-5	4	2.5M	2

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated October 30, 2024.

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