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ML4Sensibly equivalent¶ to:
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The ML4 was quite widely used as an RF oscillator, as a single-valve phase splitter, and as a driver for larger valves.Although sometimes listed as a triode output valve, the ML4 was the definitive descendent of the famous (or infamous) Type KL1 of 1926 and was primarily a professional and military type, little used in domestic radios.![](../pics/abo0168a.jpg)
The Osram label.![](../pics/abo0168b.jpg)
A closer view showing the rectangular cathode, grid and pressed and stitched anode.The classic envelope is 44 mm in diameter and, excluding the B5 base pins, is 101 mm tall.References: Data-sheet, 1040 & 1043. Type ML4 was first introduced in 1929. See also 1929 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | ![](../static/key.gif) a | g1 | h | h | k |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vg | mAa | ra | gm | Pout | ![](../static/pdflogo.gif)
| 4.0 | 1.0 | 200 | -13.5 | 17 | 3,700 | 2.7 | 0.65W |
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Updated February 17, 2015.
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