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13SPA

Sensibly equivalent to:
8D2 CV929 SP13C
    
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The 13SPA is a screened amplifier HF pentode. Two versions exist 13-SPA with external metal paint and this exhibit with a clear glass bulb.
The control grid is taken to the top cap for maximum isolation between input and output circuits. This valve was used in RF and IF stages of domestic radio receivers with a common heater chain and used for Universal AC/DC sets.
The screening is formed by the perforated cylinder and discs top and bottom. The anode is a cylinder.
The rod originating from the top of the pinch connects to the anode as does the rod at the lower end of the pinch. The connection between the outer screen and the lower disc can be seen in the centre of the image. The grid wires can be seen between the screen and lower disc.
Here the anode cylinder can be seen just inside the screen.
The classic envelope is 38 mm in diameter and, excluding the B7 base pins, is 97 mm tall.
References: Datasheet. Type 13SPA was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
m
a
g3
h
h
k
g2
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
13.0
0.2
200
200
-2.2
2.5
0.9
2.5M
2.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 11, 2018.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 heater:200ma pins:7 pin:1.m pin:2.a pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.g1
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