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DL92

Sensibly equivalent to:
1P10 2P2 3S4 CV820 CV2370 N17 VT-174
    
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The DL92 is an audio output pentode valve designed for battery portable broadcast radio receivers in the latter part of the 1940's. The output power is very small so either a high efficiency loud speaker would be used or headphones.
The picture above gives a clearer view of the lettering on the envelope. This shows it to be an import from Philips and badged as Mullard.
The thin glass tube envelope is 17 mm in diameter and excluding the B7G base pins it is 46 mm in length.
References: Datasheet & 1040. Type DL92 was first introduced in 1947.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
1.4
0.1
90
67.5
-7
7.4
1.4
0.1M
1.58
0.27
12%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 27, 2013.
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