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6AU6

Sensibly equivalent to:
6AU6A 6AU6WA 6AU6WB 6AU6WC 6J4P 6P2 CV2524 EF94
    
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The 6AU6 is an American design, here appropriately made by General Electric. The European Type designation is EF94. The 6AU6 has controlled warm-up times and is a sharp cut-off type, that is not AGC controlled. Usage is RF or AF amplification.
Above the lower mica can be seen the cathode tube and the three wire grids. The control grid is wound on copper rods for better heat conduction.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 47 mm tall.
References: Datasheet & 1040. Type 6AU6 was first introduced in 1946.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
150
-6.5
10.6
4.3
1.0M
5.2
PDF scanned from an original document held by the museum
Updated October 19, 2019.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.g3.s pin:3.h pin:4.h pin:5.a pin:6.g2 pin:7.k
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