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SP13C

Sensibly equivalent to:
13SPA 8D2 C50B CV3704
See also:
Mullard 'Straight' Screened Pentodes - Mullard Universal Valves - The origin of Pentone
    
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The SP13C from Mullard is a screened amplifier HF pentode. The similar SP13 has a CT8 base. 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.
This exhibit carries the Mullard logo but not the Pentone trade mark that was introduced in 1928. Our other SP13C is older and does carry the Pentone name but not the logo.
The reverse is plain.
The classic envelope is 40 mm in diameter and, excluding the B7 base pins, is 105 mm tall.
References: Datasheet, 1040 & 1043. Type SP13C was first introduced in 1935.

 

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 December20, 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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