Ferrocart synchronous vibrator used for car and farm radios designed to run from 6 Volt DC supply. The farm batteries were frequently charged by exchanging them with a car battery.

Ferrocart is a brand used by Electronic Industries.

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 PM413 is a synchronous type. 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.

Physical Description

Tin plated metal cylinder with six pin base.

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