During WW2 and years after, a vibrator was common technology used for vacuum tubes high voltage provision in military radio equipment.
The vibrator is an electromechanical device that was used to convert DC voltage into pulses that could be converted to higher voltage using a transformer, rectified, filtered and used as high voltage supply for vacuum tubes.
A synchronous vibrator had an extra set of contacts that took the place of the rectifier and were used as a electro-mechanical rectifier.
Various vibrators were used by the Haganah Signal Service and by the IDF during the War of Independence (1948), the Sinai Campaign (1956) and the Six Day War (1967).
