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L2Sensibly equivalent¶ to:See also:
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The L2 is a low power audio amplifier triode. The filament is probably oxide coated to achieve such a low heating power.Our other L2 exhibits have plain glass balloon envelopes, this has a later shouldered envelope and a metallic paint screening. The original valves date to around 1931, this is probably mid to late 1930s.![](../pics/acq0007a.jpg)
The reverse is plain zinc paint.The classic envelope is 38 mm in diameter and, excluding the B4 base pins, is 91 mm tall.References: Data-sheet & 1040. Type L2 was first introduced in 1931. See also 1931 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | ![](../static/key.gif) a | g1 | f | f |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | ![](../static/pdflogo.gif)
| 2.0 | 0.1 | 150 | -3.8 | 4.0 | 12,500 | 1.5 |
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PDF scanned from an original document held by the museum |
Updated September 14, 2021.
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