Here’s a link to the Radiomuseum site. Should have what you need: https://www.radiomuseum.org/r/saba_300_automatic_stereo_11.html
I’m having my own Saba issues as well. after mine stopped working and emitted a big buzz, it’s now working properly and I didn’t do a thing! It’s waiting for me to put it back together so it can act up again. I find these German radios intimidating!