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D-401ASensibly equivalent¶ to:See also:
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The D-401A replaced the D-01A in 1928. The performance was essentially identical but the physical design followed the competition with a balloon envelope and a Bakelite base cap.
The original De Forest box.Thanks to Joe Gruber for sending the images.The balloon envelope is 45 mm in diameter and, including the UX4 base pins, is 117 mm tall.Reference: Joe Gruber. Type D-401A was first introduced in 1928. See also 1928 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 |  g1 | a | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah |
| 5.0 | 0.25 |
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Updated November 14, 2020.
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