Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: Bourney on December 16, 2022, 04:20:57 PM

Title: Purpose of the fibre shoulder washers
Post by: Bourney 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.
Title: Re: Purpose of the fibre shoulder washers
Post by: Paul Joppa 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.