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AC/DDTR

Sensibly equivalent to:
MHD4 TDD4
See also:
BVA Influence
    
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The AC/DDTR is a double diode triode for detection and first AF amplifier in superhet receivers. It was an cost saving to make all three devices in a single envelope with a common cathode. This style became the normal configuration. This valve is specified for a cathode resistor of 1kΩ.
The classic envelope is 36 mm in diameter and, excluding the B7 base pins, is 96 mm tall.
References: Datasheet & 1043.

 

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
4.0
0.65
250
-5
4.0
11,400
3.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December14, 2012.
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