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SP13

 
See also:
Mullard 'Straight' Screened Pentodes - Mullard Universal Valves
    
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The SP13 screened amplifier pentode was introduced in 1934. This version has the Ct8 base and the similar SP13C has a B7 base. The use would have been for HF amplification in radio receivers. It is a non variable-mu valve and was displaced in favour of the variable μ pentode when TRF receivers gave way to mass produced superhet receivers.
The classic envelope is 40 mm in diameter, and excluding the Ct8 base pins, is 104 mm tall.
References: Datasheet, 1040 & 1043. Type SP13 was first introduced in 1934.

 

Pin Connections
Ct8
1
2
3
4
5
6
7
8
tc
m
h
h
k
g3
-
g2
a
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
ra
gm
13.0
0.2
200
100
-
3
1.3M
2.2
PDF scanned from an original document held by the museum
Updated December31, 2012.
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