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1AJ4

Sensibly equivalent to:
1F1 DF96 W25
See also:
Mullard 25 mA Series Advert, November 1954
    
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The 1AJ4 is an amplifier pentode for use in battery portable radio equipment, mainly domestic broadcast receivers. The 25 mA filament was introduced to improve battery life.
The 1AJ4 is a true pentode with three wire grids. The single strand coated filament runs centrally through the valve. The tension spring can be seen at the top of the valve.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Datasheet. Type 1AJ4 was first introduced in 1953.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f-,g3
a
g2
ic
f-,g3
g1
f+

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.025
85
64
0
1.65
0.55
1M
0.75
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December14, 2015.
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