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Old 2nd March 2018, 09:28 AM
John Caswell John Caswell is offline
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Join Date: Dec 2005
Location: Wokingham, Berkshire
Posts: 1,700
Default Re: Phono3S it's humming again.

Hi Andy,
Placing a die cast case around the Gyro PSU will not help as it is an electromagnetic field the is causing the problem. Only mumetal or distance will help and that is a seriously expensive exercise.
Why not do as I did (cos I am lazy and cannot be bothered to change over the belt) and build yourself a new PSU with a toroidal transformer and switched voltages to change speeds, assuming that you have the DC motor, as opposed to the DC Papst motor. It is not very difficult using a standard 3 pin regulator. Of course if ll you play is 33 rpm is is even easier.

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