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13SPA

Sensibly equivalent to:
8D2 CV929 SP13C
    
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The 13SPA is a screened amplifier HF pentode with external metallising.
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 grey cossor metallic paint seems to be overpainted onto a valve with gold metallic paint. The suspicion is that this a Mullard valve that has been re-branded.
The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 106 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 April 06, 2015.
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