A. W. A. vibrator used for farm radios designed to run from 4 Volt DC supply. 4 Volt DC supplies were sometimes used for farm radios before the advent of mains power.

Vibrators are used to change DC into AC which is then be stepped up by a transformer to the voltage required by the radio. The AC output is then turned back to DC to operate the radio, which is done either by a thermionic rectifier or a second set of contacts in the vibrator. A vibrator with two sets of contacts is called a synchronous type. The V6804 is a split-reed synchronous type. A split-read vibrator allows the negative side of the output to be isolated from earth. A non-synchronous type requires the use of a separate rectifier.

Synchronous vibrators tend to be quite noisy electrically and require more filtering. Both types were somewhat noisy mechanically; they hum.

Oak is a brand used by A. W. A.

Physical Description

Metal cylinder with seven pin base.

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