The SU42 is an EHT rectifier with the pre-war 4.0V British standard heater. The SU42 was made as a replacement type and requires an effective series resistance of 5,000 Ω and a maximum reservoir capacitor of 1.0 μF.
The anode has eight radial cooling fins and the ceramic at the top indicates high voltage and probably a valve designed for industrial use.The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 100 mm tall.References: 1040. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | tc |  nc | h | nc | nc | nc | nc | nc | h,k | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | mAa |
| 4.0 | 1.25 | 6,000 | 40 |
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Updated January 04, 2022.
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