The VPT4 is a vari-μ RF pentode. The heater is the original UK standard for indirectly heated valves of 4.0 Volts at 1.0 Amps.![](../pics/aaq0498a.jpg)
The reverse is plain gold metal loaded screening paint. The classic envelope is 38 mm in diameter and, excluding the B5 base pins, is 105 mm tall.Reference: 1043. Type VPT4 was first introduced in 1933. See also 1933 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | tc | ![](../static/key.gif) g2 | g1 | h | h | k,g3 | a |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm | ![](../static/key.gif)
| 4.0 | 1.0 | 250 | 100 | -3.0 | 5.5 | 3.0 | 1M | 2.3 |
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Updated October 07, 2022.
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