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EB91

Sensibly equivalent to:
6AL5 6D2 CV140 D152 D77 DD6 EAA91 M8212
See also:
Valves and their Habits
    
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This Mullard EB91 double signal diode designed these for vision and sound detection is branded Bently by the reseller.
The EB91 dates from 1949 but the American 6AL5 was produced in 1946. Prior to the EB91 there was the EB41 all glass valve and the EB34.
The most common fault with the EB91 design is heater to cathode leakage.
The original Mullard lettering on this UK made valve.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Datasheet 1040 & 3002. Type EB91 was first introduced in 1949.

 

Pin Connections
B7G
1
2
3
4
5
6
7
k(1)
a(2)
h
h
k(2)
s
a(1)

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
6.3
0.3
150
9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 19, 2018.
shape:thin.glass.tube construction:all.glass type:double.diode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.k(1) pin:2.a(2) pin:3.h pin:4.h pin:5.k(2) pin:6.s pin:7.a(1)
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