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AC/HLDDSensibly equivalent¶ to:11A2 A234 CV2813 DDT4 DDT DH42 H4D MHD4 TDD4See also:
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The AC/HLDD 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.![](../pics/ach0052a.jpg)
The reverse is plain zinc loaded screening paint.The classic envelope is 44 mm in diameter and, excluding the B7 base pins, is 107 mm tall.References: Data-sheet & 1043. Type AC/HLDD 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 | ra | gm | ![](../static/pdflogo.gif)
| 4.0 | 1.0 | 250 | 13,800 | 2.6 |
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PDF scanned from an original document held by the museum |
Updated October 10, 2022.
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