did you check the adjusteable ceramic capacitors ? They often loose their capacity caused by oxydation of the silver-surface. Sometimes turning them a bit helps. Sometimes their just dead and have to be replaced. It's a common problem at some Siemens-Radios of the 50s when the FM-Band is dead or weak.
Good luck!
Gruß,
Daniel
„Baden Baden, Beromünster, Paris, Rom…
...Eine ganze Welt ist auf der Skala des SABA-Empfängers vereint“
Thanks Daniel! but is messed up so bad.All screws are turned,Even the black screws in the plastic.
I guess is not fixable,and if it is i'm not that expert!
I could change the whole FM aluminium box i guess if i find one)