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1801Sensibly equivalent¶ to:G504See also:
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The Philips 1801 is a directly heated full wave rectifier from the early 1930s.The internal coating obscures the twin section. This looks to have been made using the Azide process.![](../pics/aaq0645a.jpg)
The identification is etched into the dome.The balloon envelope is 46 mm in diameter and, excluding the B4 base pins, is 92 mm tall.References: Data-sheet & Data. Type 1801 was first introduced in 1928. See also 1928 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | ![](../static/key.gif) a(1) | a(2) | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | mAa | ![](../static/pdflogo.gif)
| 4.0 | 0.6 | 250 | 30 |
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Updated March 29, 2023.
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