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A50A

Sensibly equivalent to:
SP4
    
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The A50A branded as Ever Ready was made for them by Mullard and is a Mullard Type SP4. When originally introduced it was fitted with a B5 base cap.
The A50A is an RF pentode.
The exhibit is new and was donated in its original box. It was expensive as the box is priced at 20/7 including purchase tax.
The classic envelope is 47 mm in diameter and, excluding the B7 base pins, is 125 mm tall.
References: Datasheet 1024 & 1043. Type A50A was first introduced in 1935.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
4.0
1.0
200
100
-2
3.0
1.1
2.2M
2.3
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated July 30, 2015.
shape:classic construction:pinch type:pentode age:1930.1940 base:b7 pins:7 pin:1.m pin:2.g1 pin:3.g3 pin:4.h pin:5.h pin:6.k pin:7.g2 pin:tc.a
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