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QP25Sensibly equivalent¶ to:See also:
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The QP25 is a pre-war quiescent push-pull double pentode for battery operation. It was still listed as current production in 1951.QPP valves operated in class B and for a 19 Volt peak to peak input signal the QP25 would deliver 1.1 Watt output at 5% distortion. See also QP230.The box matched the style of the PA20 but was smaller measuring 40 mm square by 115 tall.![](../pics/aaa0608a.jpg)
The type designation was on the top of the envelope.The classic envelope is 30 mm in diameter, and excluding the MO base pins, is 70 mm tall.References: Data-sheet & 1043. Type QP25 was first introduced in 1939. See also 1939 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ![](../static/key.gif) f- | nc | a(2) | g2 | g1(2) | g1(1) | a(1) | f+ |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | Pout | ![](../static/pdflogo.gif)
| 2.0 | 0.2 | 120 | 120 | -9.75 | 2.3 | 0.43 | 1.2W |
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Updated January 04, 2022.
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