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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.![](../pics/aco0076a.jpg)
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 | ![](../static/key.gif) g1 | a | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | ![](../static/key.gif)
| 5.0 | 0.25 |
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Updated November 14, 2020.
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