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3S4Sensibly equivalent¶ to:See also:
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The 3S4 is an audio output pentode valve designed for battery portable broadcast radio receivers. The output power is very small so either a high efficiency loud speaker would be used or headphones. The design dates to the late 1940's.![](../pics/abh0277a.jpg)
The maker's name and Made in USA.The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins it is 47 mm tall.References: Data-sheet, 1040 & 1043. Type 3S4 was first introduced in 1941. See also 1941 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | ![](../static/key.gif) f | a | g1 | g2 | hct,g3 | a | f+ |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | Pout | D | ![](../static/pdflogo.gif)
| 1.4 | 0.1 | 90 | 67.5 | -7 | 7.4 | 1.4 | 0.1M | 1.58 | 0.27 | 12% |
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Updated March 12, 2022.
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