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1S4

Sensibly equivalent to:
CV783 DL91
See also:
Brimar 1R5, 1S4, 1S5, 3S4, 1T4 & 3V4 Advert - CV783 short entry
    
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The 1S4 is a dry battery audio output valve that is identical to the CV783.
The thin glass tube envelope is 17 mm in diameter, and excluding the base pins is 45 mm tall.
References: Datasheet, 3002 & 1043. Type 1S4 was first introduced in 1940.

 

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

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
rl
Pout
D
1.4
0.1
90
67.5
-7.0
7.4
1.4
0.1M
1.575
8,000
0.27W
12%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 06, 2015.
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