The VHTS is a heptode (pentagrid) mixer or frequency changer. The 300 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 VHTS is similar to the TH13C.![](../pics/abo0080a.jpg)
The reverse is plain gold coloured zinc paint. The balloon envelope is 44 mm in diameter, and excluding the B7 base pins is 107 mm tall.References: 1040 & 1043. Type VHTS was first introduced in 1934. See also 1934 adverts. |
Pin Connections
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | tc | ![](../static/key.gif) 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 | ![](../static/key.gif)
| 13.0 | 0.3 | 200 | 100 | -3 | 2.3 | 5.3 | 0.5M | 0.7 |
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Updated November 27, 2014.
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