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Ste_S
That reciever is from 1975, in terms of capacitor life it's ancient!
If I were you what I would do is buy some contact cleaner (the wd40 is good and has PTFE in it), open it up and clean all the pots and switches inside where the connections are. It's as simple as spreading them and cycling them 10-20 times. Then hopefully that'll be it, otherwise be prepared to buy a multimeter to check that all your capacitors are working as they should, if they're not they'll need replacing, which shouldn't be hard on that receiver. Technics components from that era are laid out in very straight forward manner.
Also Hi-Fi Engine has a manual.
P.S. I've got a Technics turntable from 1979, it's great but needs some tweaking now and again. Recently I cleaned all the pots because it wasn't keeping time, and that resolved it. I also replaced the power cable because it was a bit corroded.