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PM1HFSensibly equivalent¶ to:
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This battery triode was designed in 1926 for the HF stages in broadcast receivers. The filament would be run from a 2.0 Volt accumulator.The electrodes lie horizontally in the balloon envelope.![](../pics/aaq0664a.jpg)
The feint etched identification can just be seen.The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 83 mm tall.References: 1931 data-sheet & 1043. Type PM1HF was first introduced in 1926. See also 1926 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | ![](../static/key.gif) a | g1 | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | ![](../static/pdflogo.gif)
| 2.0 | 0.1 | 100 | 0 | 2.3 | 22.5k | 0.8 |
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Thanks to Andy Cowley for supplying the above PDF datasheet. |
Updated May 20, 2023.
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