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42Sensibly equivalent¶ to:See also:
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The 42 is an audio output pentode, with a low output rating, but when used in push pull a pair could deliver 18.5 Watts in class AB2.Also on a UX6 base is the 2.5 Volt 2A5 that is electrically equal to the type 42. The Type 6F6 is also electrically identical, but on an IO base.![](../pics/aai0488a.jpg)
An overprint on the glass of the UK supplier based in Portsmouth, Hampshire.The classic envelope is 44 mm in diameter and, excluding the UX6 base pins, is 102 mm tall.References: Data-sheet, 1040 & 1043. Type 42 was first introduced in 1936. See also 1936 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | ![](../static/key.gif) h | a | g2 | g1 | k | h |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | Pout | ![](../static/pdflogo.gif)
| 6.3 | 0.7 | 250 | 250 | -16.5 | 34 | 6.5 | 80k | 2.5 | 3.2W |
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Updated February 23, 2022.
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