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Sensibly equivalent¶ to:- 11A2 - AC/HLDD - CV3727 - DDT - DDT4 - H4D - MHD4 - A23A - TBC14 - AC/DDT - DT436 - DDT4160 - DDT4 - AC/HL4DD - DT41
See also: Mullard AC Mains Valves
This exhibit was last updated on 14 December 2012 | |
The TDD4 is an indirectly heated double diode triode for mains superhet receivers. It was designed for signal and AGC detection and then as the first post detection amplifier.
We have several versions, this is believed to be of post WWII manufacture but the design dates to 1933. The style of the Mullard logo is the guide.
The classic envelope is 35 mm in diameter and, excluding the B7 base pins, is 106 mm tall.
References: Datasheet & 1043. Type TDD4 was first introduced¶ in 1933.
Pin Connections
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
tc |
|
a(d2) |
m |
a(d1) |
h |
h |
k |
a |
g1 |
Absolute Maximum Operating Conditions¶
|
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
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