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AC/VP1Sensibly equivalent¶ to:See also:
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The AC/VP1 is a variable μ screened pentode designed for mains radio receivers. The variable μ characteristic enables automatic gain control of RF and IF amplifiers in superhet receivers. Two base variants exist, the original B5 and the B7 that was made from 1939.The AC/VP1 and AC/VP2 were the standard RF/IF screened pentodes in the Mazda range for AC mains radios from the mid-1930s until domestic radio manufacture was interrupted by WWII.The two valve types were essentially identical except that the AC/VP1 has its anode connected to the top cap, as with most screen-grid valves. The AC/VP2 has the control grid (g1) connected to the top cap, as was standard for later IF pentodes.![](../pics/ach0014a.jpg)
The reverse is left as the plain zinc loaded screening paint. The classic envelope is 39 mm in diameter and, excluding the B7 base pins, is 103 mm tall.Reference: Data-sheet. Type AC/VP1 was first introduced in 1934. See also 1934 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc | ![](../static/key.gif) m | g1 | g3 | h | h | k | g2 | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/pdflogo.gif)
| 4.0 | 0.65 | 250 | 250 | -2.8 | 7.4 | 1.85 | 1M | 2.0 |
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PDF scanned from an original document held by the museum |
Updated June 09, 2020.
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