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1P11

Sensibly equivalent to:
3V4 DL94 N19
    
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The 1P11 is identical to the 3V4 and is an audio output pentode. The 1P11 was designed for use in battery portable radio receivers. The filament is centre tapped allowing for 1.4 or 2.8 V working.
All the original printed identification has been rubbed off. Checking the pin connections verified that this was correctly marked.
The end of the oval anode.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
References: Data-sheet & 1040. Type 1P11 was first introduced in 1946.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
rl
Pout
D
1.4
0.1
90
90
-4.5
9.5
2.1
100,000
2.15
10,000
0.27
7%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 10, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:1.4v pins:7 pin:1.f- pin:2.a pin:3.g2 pin:4.- pin:5.fct pin:6.g1 pin:7.f+
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