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D42

Sensibly equivalent to:
ARD4 CV557 CV1302 CV2394
See also:
Osram D42, HA1, H42, N43, U16, U17, U18 & W42 Valves Advert
    
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The D42 is a single signal diode designed as a second detector or as an AGC rectifier in superhet receivers.
The Marconi brand label on this M-OV product.
The dome carries the Type designation. The cathode can be seen as a round tube.
Thanks to Mark Mallison for sending the images.
The classic envelope is 29 mm in diameter, and excluding the B4 base pins is 79 mm tall.
Reference: Datasheet. Type D42 was first introduced in 1936.

 

Pin Connections
B4
1
2
3
4
a
k
h
h

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
4.0
0.6
75
15.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 13, 2018.
shape:classic construction:pinch type:diode age:1930.1940 base:b4 heater:4.0v pins:4 pin:1.a pin:2.k pin:3.h pin:4.h
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