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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 17 January 2013 | |
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
|
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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