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7A7E

Sensibly equivalent to:
7A7
    
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The 7A7E is a pentode voltage amplifier. The 14A7/12B7 differ only in heater rating.
The Brimar name and BVA. The made in ends with U and the second or subsequent letters are missing. So this may be an import from America or Made in UK.
Thanks to Mark Mallison for sending the images.
The wide glass tube envelope is 29 mm in diameter, and excluding the B8B base pins is 57 mm tall.
Reference: datasheet. Type 7A7E was first introduced in 1938.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
g2
g3
m
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-3.0
9.2
-
0.8M
2.0
Updated October 13, 2019.
shape:wide.glass.tube construction:all.glass type:pentode age:1950.1960 base:b8b heater:6.3v pins:8 pin:1.h pin:2.a pin:3.g2 pin:4.g3 pin:5.m pin:6.g1 pin:7.k pin:8.h
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