M8081 @ The Valve Museum

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M8081

Sensibly equivalent^¶ to:

6101/6J6WA CV4031

See also:

Special Quality Valves - Mullard Special Quality Valves

Extras ▼

Mullard TNMoC The National Museum of Computing - Valves Other M8081 exhibits

The M8081 is the special quality version of the ECC91. The design purpose was as a VHF oscillator or power amplifier of one Watt output.

The control grids are wound on thick copper supports and both face the central cathode.

This image shows the clearance between the shaped grid wires and the cathode. The anodes are U channel sections either side of the central cathode.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type M8081 was first introduced in 1960. See also 1960 adverts.

Pin Connections

B7G	1	2	3	4	5	6	7
	a(2)	a(1)	h	h	g(1)	g(2)	k

Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.45	100	-0.85	8.5	7100	5.3

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated August 06, 2020.

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