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E91H

Sensibly equivalent to:
6687
    
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The E91H from Mullard is described as a dual control heptode for use in computer circuits. It is a special quality valve as denoted by the style of the designation with the figures before the type code and the gold plated pins.
The anode from the side, crowded with five grids.
The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 53 mm tall.
References: Datasheet & 3002. Type E91H was first introduced in 1957.

 

Pin Connections
B7G
1
2
3
4
5
6
7
g1
k,g5
f
f
a
g2,g4
g3

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
6.3
0.27
150
75
-1.5
3.3
-
20,000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 08, 2013.
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