The MSPen (1933) had the anode connected to the top cap. In the 'B' variant of 1937, the same device had the control grid connected to the top cap. The signal isolation afforded by taking the control grid to the top cap became standard practice for most manufacturers.The amplifier pentode would have been used in RF and IF stages of domestic radio receivers.![](../pics/aad0250a.jpg)
The reverse is plain zinc paint - an external metal screen.The classic envelope is 45 mm in diameter and, excluding the B7 base pins, is 109 mm tall.References: Data-sheet & 1043. Type MSPenB was first introduced in 1937. See also 1937 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc | ![](../static/key.gif) m | a | g3 | h | h | k | g2 | g1 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/pdflogo.gif)
| 4.0 | 1.0 | 200 | 100 | -1.5 | 4.8 | 1.3 | 0.8M | 2.8 |
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Updated March 07, 2024.
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