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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.
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 |  a(1) | a(2) | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | mAa | 
| 4.0 | 0.6 | 250 | 30 |
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Updated March 29, 2023.
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