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L2

Sensibly equivalent to:
210LF AR9 CV1307 CV3531 L21 VR21 VR22
    
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The L2 is a low power battery audio amplifier triode. The envelope and base are typical Lissen of the period. The identification appears feint yellow on the dome of the envelope. The Type L2 and the word Lissen can be read.
The gettering makes it difficult to see the construction.
The balloon envelope is 42 mm in diameter and, excluding the B4 base pins, is 81 mm tall.
References: Datasheet, 1043 & 1040. Type L2 was first introduced in 1931.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.1
150
-3.0
5.0
10,000
1.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 13, 2015.
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