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TDD4

Sensibly equivalent to:
11A2 A23A AC/DDT AC/HL4DD AC/HLDD CV3727 DDT4 DDT4 DDT4160 DDT DT41 DT436 H4D MHD4 TBC14
See also:
Mullard AC Mains Valves
    
Extras ▼

 

The TDD4 is an indirectly heated double diode triode for mains superhet receivers. It would have been used for signal and AGC detection and then as the first post detection amplifier.
The classic envelope is 35 mm in diameter and, excluding the B7 base pins, is 98 mm tall.
References: Datasheet, 1040 & 1043. Type TDD4 was first introduced in 1933.

 

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
-7
4.0
13,500
2.0
PDF scanned from an original document held by the museum
Updated January 17, 2013.
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