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.
Tin plated metal cylinder with six pin base.
Donation from Mrs Kennedy, 12/11/1984
Ferrocart, South Melbourne, Greater Melbourne, Victoria, Australia, circa 1935
Please note that the date is suggested to be circa 1935 based on the style of the paper label and the type of can, which is fabricated rather than drawn.
Paper label: FERROCART VIBRATOR / FERROCART (A.SIA.) PTY. LTD. 126 GRANT ST. SOUTH MELBOURNE / DO NOT DETACH THIS LABEL / PACKED / (illegible) Paper label on top end of can: SYNC. / 100 CYCLE / 6 VOLT / PM 413
Type of item
94 mm (Length)