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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 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.
Here the electrodes can be seen through the gettering inside the envelope. All the Triotron valves of the early 1930's were made by the Adide process that blackened the inside of the glass when the filament coating was decomposed to form the emissive surface.
A closer view. The anode box is open at the ends to allow the decomposition products to exit.The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 87 mm tall.References: Data-sheet, Data, 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 | 150 | -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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PDF scanned from an original document held by the museum |
Updated August 27, 2024.
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