A few squirts on both the left and the right controls and turning the switch a few times did the trick

Case off, shot of DeoxIT, work the control, and back together again.

The infamous slider controls would barely move and the SSB switch would need to be pressed 3 or 4 times to properly toggle LSB/USB.

Worked the controls at little and reassembled.

I used this on my old Marantz, which had very touchy controls.

If you have a scratchy volume control get this stuff.

; all controls worked smoothly and quietly.