SABA - HiFi Studio 8100 Solid state stereo receiver

Saba receiver Saba HiFi-Studio 8100 from 1974 comes from a hi-fi collection and has not been used for more than 40 years.
I tested the SABA yesterday; it powers on and the radio works; I tested it with a small speaker.
It plays.
The button for the speaker selector sticks and you cannot switch to 4 speakers, so only the front speakers play. I assume the selector is dirty or defective due to age.
The on/off switch also sticks a little; you have to press it a few times, but it works.
Otherwise all the knobs work, as do the station sensors.
Visual condition: very good with a few signs of use.
Saba receiver weighs almost 14 kg.
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