The UD2 is an audio output triode. Triotron describe it as a Super Power type at a time when a quarter of a Watt could seem loud. The very similar four volt version was the UD4.The first set of operating conditions relate to its introduction in 1927 and the second set to the improved version from 1933.Triotron made a series of output valves with various power output ratings. ZD2 had the lowest power rising to SP2 with the greatest. The series was: ZD2, UD2, YD2 & SP2. A similar series existed for four volt valves.The silver gettering obscures all of the internal structure.The balloon envelope is 48 mm in diameter, and excluding the B4 base pins is 86 mm tall.References: 1043 & Advert Type UD2 was first introduced in 1927. See also 1927 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 |  a | g1 | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | rl | Pout |
| 2.0 | 0.22 | 180 | -22 | 15.0 | 3,000 | 1.8 | ,7,000 | 0.27 |
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Absolute Maximum Operating Conditions¶
| Va | Vg | mAa | ra | gm | rl | Pout |
| 150 | -15 | 15.0 | 2,700 | 2.0 | 5,000 | 0.5 |
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Updated May 26, 2018.
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