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M8081

Sensibly equivalent to:
6101/6J6WA CV4031
See also:
Special Quality Valves - Mullard Special Quality Valves
    
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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.

 

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.
shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b7g heater:6.3v pins:7 pin:1.a pin:2.a pin:3.h pin:4.h pin:5.g pin:6.g pin:7.k
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