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DH63MSensibly equivalent¶ to:
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The DH63M is a double diode triode designed for receiver use. Diode detection and diode AGC rectification together with a triode for first audio voltage amplifier. A classic part of The 'Magic Three' Valves.The M suffix denotes the external metallisation. The DH63 is a plain glass type.The diodes would be for signal and AGC rectification and the triode would act as AGC amplifier or first audio amplifier.![](../pics/abi0014a.jpg)
The Osram brand and BVA.The wide glass envelope is 29 mm in diameter and, excluding the IO base pins, is 87 mm tall.References: Data-sheet. Type DH63M was first introduced in 1937. See also 1937 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | tc | ![](../static/key.gif) m | h | a | a(d2) | a(d1) | nc | h | k | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | ![](../static/pdflogo.gif)
| 6.3 | 0.3 | 250 | -3 | 1 | 58k | 1.2 |
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Updated November 03, 2022.
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