NOTES:

The input jacks should be installed exactly as shown with the ground tabs facing as shown. Be sure to NOT use both white plastic washers. The inside portion of the jack should be touching the chassis as shown.

It is not likely that these jacks will actually be grounded to the chassis due to the heavy powder coat paint on the chassis. This is not a problem as these jacks and the volume control will be connected to a ground wire that ultimately leads to a single point on the chassis.