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DDTSensibly equivalent¶ to:11A2 A23A AC/HL/DD HD4 MHD4 TDD4See also:
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The DDT is a double diode triode for detection and first AF amplifier in superhet receivers. It was introduced in 1933 and the data-sheet makes it clear that it was intended for Automatic Volume Control (now called AGC) and explains how to use the diodes.![](../pics/abp0003a.jpg)
The reverse is plain zinc paint.The classic envelope is 45 mm in diameter and, excluding the B7 base pins, is 106 mm tall.References: Data-sheet & 1043. Type DDT was first introduced in 1933. See also 1933 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc | ![](../static/key.gif) a(d2) | m | a(d1) | h | h | k | a | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | ![](../static/pdflogo.gif)
| 4.0 | 1.0 | 200 | -3 | 3.4 | 17,000 | 2.4 |
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Thanks to Andy Cowley for supplying the above PDF datasheet. |
Updated October 02, 2022.
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