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UX281Sensibly equivalent¶ to:281 AC81
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This American half wave rectifier features a directly heated oxide filament.
From the top the ribbon coated filaments can be seen. Each inverted 'V' having its own tensioning spring. The anode is carbonized for greater heat radiation.The balloon envelope is 60 mm in diameter and, excluding the UX4 base pins, is 133 mm tall.Reference: 3002. Type UX281 was first introduced in 1928. See also 1928 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 |  f | a | nc | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah |
| 7.5 | 1.2 |
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Updated January 08, 2022.
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