Purpose of the fibre shoulder washers

Bourney · 1438

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Offline Bourney

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on: December 16, 2022, 04:20:57 PM
Hi all,

Hoping someone can educate me on the purpose of the fibre shoulder washers used to mount the OT3s.

I can see they are insulating the screw from the chassis, but then we connect the OT3 and the screw to the main ground lug anyway.

Is the aim to achieve a single point of ground? Or are we trying to insulate from possible vibration from the transformer?

Thanks for any guidance you can share.

Offline Paul Joppa

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Reply #1 on: December 16, 2022, 06:11:24 PM
Yes, it's to provide a single point chassis (safety) ground. It kills one of the many possible causes of hum and/or radio interference.

Paul Joppa