The VHTA is a heptode (pentagrid) mixer or frequency changer. The 200 mA heater indicates that it was for use with a series heater chain across the mains. The anode voltage of 200 Volts is consistent with UK mains voltages. The signal is taken to grid 4 at the top cap.
The B7 Base pins.Thanks to Mark Mallison for sending the images.The balloon envelope is mm in diameter, and excluding the B7 base pins is mm tall.References: 1040 & 1043. Type VHTA was first introduced in 1935. See also 1935 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc |  g2 | g1 | g3,g5 | h | h | m,k | a | g4 |
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Absolute Maximum Operating Conditions¶
| Vh | Ah | Va | Vs | Vg | mAa | mAs | ra | gm |
| 13.0 | 0.2 | 200 | 100 | -1.5 | 3.2 | 5.6 | 0.5M | 0.65 |
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Updated August 23, 2022.
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