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2D13A

Sensibly equivalent to:
DDA/13L
    
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The 2D13A is a single ended double signal diode. The 2D13, with top cap, and 2D13C with a conventional B5 base cap (albeit of small diameter - see exhibit 2D4A) are electrically identical.
The 'P5' side-contact base cap was, we think, a Philips special (P = Philips?) and was also used on a few TV tubes, including the miniature MW6/2 projection tube.
Valves with side-contact base caps were widely used in Philips sets during the 1930s but some other set manufacturers disliked them so Mullard were forced to market '-C' versions of their side-contact types.
The classic envelope is 28 mm in diameter and, excluding the Ct5 base pins, is 78 mm tall.
References: Datasheet & 1043. Type 2D13A was first introduced in 1935.

 

Pin Connections
Ct5
1
2
3
4
5
a(1)
h
h
k,m
a(2)

 

Absolute Maximum Operating Conditions
Diode
Vh
Ah
Va
mAa
13.0
0.2
200
0.8
PDF scanned from an original document held by the museum
Updated April 03, 2014.
shape:classic construction:pinch type:double.diode age:1930.1940 base:ct5 heater:200ma pins:5 pin:1.a(1) pin:2.h pin:3.h pin:4.k.m pin:5.a(2)
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