Re: Quad 11 Problem.
Yes that's fine when you move the filter dials you will alter the sound volume bass and treble as they are in essence used to fine tune the sound. You'll find as you turn them volume drop bass may increase decrease and the same for the treble.
The black on the contacts is usually not corrosion but a protective layer to stop corrosion. If they have powdery white stroke green deposits then that's signs of corrosion I.e been exposed to damp humid environment depending on where they where stored.
When you push the buttons you should see a track line but you will need the adapters to test whether there making contact or not as they are generally for a deck and the different type of vinyl and needle you use.
The rca Jack's are worth changing try and find those with a small thread and not too long so you don't need to drill too large a hole to fit them in pretty easy job. Pic attached of some installed.
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