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5591

Sensibly equivalent to:
403B
    
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The 5591/403B is a physically small special quality amplifier pentode for use as a low noise amplifier at VHF and UHF and the design dates to the late 1940s. The 6AK5W et al have slightly different heater ratings.
The supports for the three wire grids can be seen through the notch in the anode.
Here the two outer grids are very clearly seen. The control grid appears as small ripples close to the cathode in this image.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 35 mm tall.
References: Data-sheet & 3002. Type 5591 was first introduced in 1947.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.15
180
180
-2
7.2
2.4
0.69M
5.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 26, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k.g3 pin:3.h pin:4.h pin:5.a pin:6.g2 pin:7.k.g3
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