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.
Absolute Maximum Operating Conditions¶
Updated August 23, 2022.