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Vibrator - AWA Oak, Type V6804, 1950 Object Reg. No: ST 035819

Summary:
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.
Description:
Metal cylinder with seven pin base.
Acquisition Information:
Donation from Mrs Kennedy, 1984
Discipline: Technology
Dimensions: 92 mm (Length), 33 mm (Diameter)

More information

Tagged with: radios, electronic vibrators
Themes this item is part of: Information & Communication Collection
Primary Classification: COMMUNICATIONS
Secondary Classification: Radio
Tertiary Classification: components
Inscriptions: Paper label: OAK VIBRATOR UNIT / SYNCHRONOUS / AWA / MADE IN AUSTRALIA BY / AMALGAMATED WIRELESS (A'SIA) LTD / No. V6804 / INPUT / / VOLTS
Top end of can: (illegible) / 63UH
Manufacturer: Amalgamated Wireless (Australasia) Ltd., circa 1950

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