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1LA4

 
    
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The 1LA4 is a battery audio output valve. With a 27,000 Ω load the output can be up to 115 mW. The 1AL4 is high impedance pentode. It is a Loctal based valve and the 1A5G is the octal alternative.
The oval anode from the side.
The Type designation is etched into the top of the envelope in the traditional RCA octagon.
The wide glass tube envelope is 29 mm in diameter, and excluding the B8B base pins is 56 mm tall.
Reference: Data-sheet. Type 1LA4 was first introduced in 1940.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
f
a
g2
-
-
g1
-
f,g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
110
110
-4.5
5.0
1.0
0.3M
8.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 21, 2020.
shape:wide.glass.tube construction:all.glass type:pentode age:1930.1940 base:b8b heater:1.4v pins:8 pin:1.f pin:2.a pin:3.g2 pin:4.- pin:5.- pin:6.g1 pin:7.- pin:8.f.g3
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