Hello all vintage products fans!
I have the same trouble with my Beomaster 800. The radios below 95Mhz have an important hiss for the most powerful ones and can't be tuned at all for the faintest.
Above all is perfect, no hiss or very few in stereo.
I re-made some soldered joints on the tuner board which seemed to me bad and dry, and then, this trouble has disappeared a little but the reception is still better above 95Mhz.
All ideas will be greatly apreciated!
Marc