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14S7

Sensibly equivalent to:
CV3936
    
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The 14S7 is a triode heptode frequency changer from 1948. The American valves with designations starting with 14 were designed for operation on nominal 12 Volt vehicle supplies. The 7S7 has identical operating characteristics but with a standard 6.3 Volt heater.
The B8B or Loctal base as equi-spaced pins and so a locating spigot with key and a locating pip on the metal skirt are essential. The dark cylinder is the electrostatic screen, this screen extends down to the base to shield the anode pin.
Some of the helical wire grids.
The wide glass tube envelope is 29 mm in diameter and, excluding the B8B base pins, is 58 mm tall.
References: Datasheet & 1040. Type 14S7 was first introduced in 1948.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
a(t)
g1(t),g3
g2,g4
g1
k,s
h

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
gm
12.6
0.15
250
100
-2
1.8
0.53

 

Absolute Maximum Operating Conditions
Triode
Va
150
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 03, 2017.
shape:wide.glass.tube construction:all.glass type:triode.heptode age:1940.1950 base:b8b heater:12.6v pins:8 pin:1.h pin:2.a pin:3.a(t) pin:4.g1(t).g3 pin:5.g2.g4 pin:6.g1 pin:7.k.s pin:8.h
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