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QV05-25Sensibly equivalent¶ to:See also:
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![](../pics/aaa1652.jpg)
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The QV05-25 from Mullard is another example of the design known as the 807. The QV05-25 is a beam tetrode. and this example was made in Canada. The distinctive feature is the fluted top cap.The parameters given are for single ended use. When used in a class AB1 as a push pull pair with 600 Volts on the anode an output power of 65 Watts was normal.The QV05-25 was an HF RF amplifier and used in many designs in the 1950s. As a transmitter power amplifier (shown in the lower table) operating in class C producing 40 Watts of RF, it would need a pair of 807s in push pull to generate the 20 Watts of audio required to fully modulate the valve.![](../pics/aaa1652a.jpg)
The oval screen below the lower mica is a feature of the 807 design.![](../pics/aaa1652b.jpg)
The additional support struts are connected to the lower screen.The classic envelope is 51 mm in diameter, and excluding the UX5 base pins is 127 mm tall.References: Data-sheet & 1040. Type QV05-25 was first introduced in 1947. See also 1947 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | tc | ![](../static/key.gif) h | g2 | g1 | k | h | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | Pout | ![](../static/pdflogo.gif)
| 6.3 | 0.9 | 300 | 250 | -14 | 83 | 8 | 20k | 6.5 | 6.7W |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | mAg | Pdriv | Pdiss | Pout | freq | f.max | ![](../static/key.gif)
| 6.3 | 0.9 | 600 | 250 | -45 | 100 | 7 | 3.5 | 0.2W | 25W | 40W | 60 | 125 |
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Updated September 28, 2016.
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