CV1901 @ The Valve Museum

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CV1901

Sensibly equivalent^¶ to:

6F11

Extras ▼

Thorn Donation from Jeremy Harmer

The CV1901 (commercially the 6F11) is a screened RF pentode. The B8A base is of the earliest type with a metal skirt, locating pip and base spigot

The EN identifies the maker as Thorn-AEI, Sunderland.

The locating pip was required as the pins are spaced equally around the base. The spigot is cylindrical and no key is present.

The three wire grids can just be seen.

The thin glass tube envelope is 20 mm in diameter, and excluding the B8A base pins is 53 mm tall.

References: Data-sheet & ¹⁰⁴⁰.

Pin Connections

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

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.2	250	100	-1.8	4.4	1.35	2.8M	2.2

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated March 10, 2026.

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