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A20B

Sensibly equivalent to:
2D4A CV1119 D41 V914 VR119
    
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The A20B from Ever Ready is a Mullard 2D4A supplied under licence. As the base matches the Mullard device and it is suspected that that was made by Philips in Eindhoven, then it is probable that this also had a Dutch origin.
Electrically the valve is a pair of signal diodes with a common cathode. The valve design is from 1934 and the diodes would have been used for demodulation at, probably at around 455 - 500 kHz, the IF frequency of broadcast radio receivers.
The classic envelope is 28 mm in diameter and excluding, the B5 base pins, is 72 mm tall.
References: Datasheet & 1043. Type A20B was first introduced in 1934.

 

Pin Connections
B5
1
2
3
4
5
a(1)
a(2)
h
h
k

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
4.0
0.65
200
0.8
PDF scanned from an original document held by the museum
Updated December29, 2012.
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