TNP #56 - Variable Vacuum Capacitors Exist! Analysis & Experiments with Multi-kV Vacuum Tube Caps
In this episode Shahriar takes a look at some fascinating variable vacuum tube capacitors. These devices are mechanically adjustable to achieve a wide range of capacitance values. Despite the narrow gab between the parallel cylinder plates, they support up to 10kV operation.
The internal structure & principle operation of the capacitors are covered. A Zurich Instruments MFIA Impedance Analyzer is used to measure the capacitance values across their tuning ranges. One unit has a DC motor assembly attached to the adjustment point which allows the capacitor to be electronically adjusted. Lastly, a high-voltage DC power supply is used to demonstrate that the capacitor can easily withstand its rated 5kV operation.
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