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UCH81Sensibly equivalent¶ to:10C14 19D8 X119
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The UCH81 is a triode oscillator and heptode mixer for use as a frequency changer in superhet receivers. This exhibit is British Made. The 100 mA heater is designed for universal mains sets, and this is why the anode voltage is 200 maximum.![](../pics/abv0009a.jpg)
The mesh screen hides most of the details but through the cap can be seen the triode section at the top. Also visible is the screening plate that shields pin 6 - the main anode.The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 60 mm tall.References: Data-sheet & 1040. Type UCH81 was first introduced in 1953. See also 1953 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ![](../static/key.gif) g2,g4 | g1 | k,g5,s | h | h | a(h) | g3 | a(t) | g1(t) |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/pdflogo.gif)
| 19.0 | 0.1 | 200 | 119 | -2.6 | 3.7 | 8.1 | 1.0M | 0.78 |
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Absolute Maximum Operating Conditions¶
| Va | Vg | mAa | ![](../static/key.gif)
| 100 | 0.0 | 13.5 |
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Updated January 29, 2016.
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