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GU1Sensibly equivalent¶ to:CV1262 NU7 RG1-250
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The GU1 rectifier is a mercury vapour half wave rectifier that is unusual in having only three base pins. The pins are to the B4 base pattern with pin two absent.![](../pics/aaa0580a.jpg)
The envelope is at first seen as black and opaque, but in strong light and viewed at a shallow angle from the base the internal structure is revealed. The anode is a square grey flat plate. The filament is a thick coil of wire supported at either end, that at its closest is 2 mm away from the anode plate. With full filament current applied the envelope warms but the filament does not glow.The GU1 was very popular as a rectifier for cinema amplifiers (etc.) but it had a short life and was discontinued in favour of the GU50.The balloon envelope is 42 mm in diameter and, excluding the B4 base pins, is 88 mm tall.References: Data-sheet & 1043. Type GU1 was first introduced in 1930. See also 1930 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | ![](../static/key.gif) a | nc | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | mAa | ![](../static/pdflogo.gif)
| 4.0 | 3.0 | 1000 | 250 |
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Updated January 04, 2022.
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