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13DHA

Sensibly equivalent to:
11D3 202DDT H4D HL/DD/1320 TDD13C
    
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The 13DHA exhibit is a double diode triode. The 200 mA heater suggests mains use in AC/DC sets. The double diode triode was extensively used in superhet receivers as signal detector, AGC rectifier and first audio amplifier stage.
The classic envelope is 43 mm in diameter and, excluding the B7 base pins, is 104 mm tall.
References: Datasheet & 1043. Type 13DHA was first introduced in 1934.

 

Pin Connections
B7
1
2
3
4
5
6
7
tc
a(d2)
m
a(d1)
h
h
k
a
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
13.0
0.2
250
-1.5
1.0
83,300
1.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December13, 2012.
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