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SP4BSensibly equivalent¶ to:CV3703
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The SP4B from Mullard is a short grid base (straight) indirectly heated HF pentode with a second application at LF. The heater voltage is the then standard UK value of four Volts.![](../pics/acn0091a.jpg)
The B7 base cap and pins.Thanks to Mark Mallison for sending the images.The classic envelope is mm in diameter, and excluding the B7 base pins is mm tall.References: Data-sheet, Data & 1043. Type SP4B was first introduced in 1935. See also 1935 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 | ![](../static/pdflogo.gif)
| 4.0 | 0.65 | 250 | 250 | -0 |
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Updated October 29, 2022.
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