Replacing selector knob


The selector knob on my integrated amp is suddenly making a lot of noise and not really letting the signal through.  Can this be fixed or can the knob be replaced with a better piece?The company is out of business, so going through them is not an option.
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Is the "knob" bad or the selector switch? Replacing the switch would be a lot of work, so try a good cleaner/lubricant that has been suggested.
terminology: its the switch contacts that are flaky.  The know is the handle and is decorative.

The fix is likely electronics parts cleaner followed by a lubricant. but we do not know, you need to take it apart and also look for mechanical damage.

Its why i only design now with fully sealed relays under computer control.