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6AL5

Sensibly equivalent to:
6058 6D2 CV140 CV283 D152 D77 DD6 EAA91 EB91
See also:
Valves and their Habits
    
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The 6AL5 is a double signal diode. Mullard separate rectifier diodes and signal diodes in their naming convention and the EB91 would be their own version of this valve. It is interesting that Mullard have used another manufacturers type designation.
The two valves are completely separate flat structures separated by a plate screen. This clearly shows the signal usage, where it is important to keep RF isolation.
These double diodes were designed for sound and vision detection in 405 line televisions. Additionally they are recommended for limiting and DC restoration, again part of a TV receiver functionality.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 37 mm tall.
References: Data-sheet & 1040. Type 6AL5 was first introduced in 1945. See also 1945 adverts.

 

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 January 02, 2015.
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