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1L4

Sensibly equivalent to:
1F2 CV1758 DF92
    
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The 1L4 is a miniature voltage amplifier pentode with low filament current consumption. The Mullard equivalent from its 1950s range is DF92. It would be used for portable domestic radio equipment. The CV1758 is a direct equivalent.
The RCA datasheet shows tentative data for the 1L4 in 1942 but B7G based valves were made in the UK from the late 1940's onwards.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 44 mm tall.
References: Datasheet & 1040. Type 1L4 was first introduced in 1941.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
90
67.5
0
3.7
1.4
0.5M
1.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 08, 2013.
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