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Oldmadham · 11th Dec 2019, 3:49 pm

The postwar turntables used in Oz used induction motors, driving a cylindrical stepped driver wheel, which mated with a "rubber tyred" "idler wheel" which then drove the inner rim of the turntable.

The steps allowed the selection of the various speeds, eg., 78, 45, 33, & sometimes, 16.

All sweet, but in Western Australia, up to about the late '40s, early '50s, the Mains frequency was 40Hz.
Machine shops had a "nice little earner" making replacement stepped driver wheels, which were fitted by the local distributors of such turntables, with the originals saved for the day we would change to 50Hz.

That day came, & the distributors then sold those original driver wheels to those needing to update their equipment.

11th Dec 2019, 3:49 pm	#30
Oldmadham Pentode Join Date: Sep 2019 Location: Perth, Western Australia, Australia. Posts: 199	Re: Question on Recording speeds The postwar turntables used in Oz used induction motors, driving a cylindrical stepped driver wheel, which mated with a "rubber tyred" "idler wheel" which then drove the inner rim of the turntable. The steps allowed the selection of the various speeds, eg., 78, 45, 33, & sometimes, 16. All sweet, but in Western Australia, up to about the late '40s, early '50s, the Mains frequency was 40Hz. Machine shops had a "nice little earner" making replacement stepped driver wheels, which were fitted by the local distributors of such turntables, with the originals saved for the day we would change to 50Hz. That day came, & the distributors then sold those original driver wheels to those needing to update their equipment.