So if my phono preamp (Ifi Iphone 2) is not stable enough, why some records play very clean. Should all play with noise in that case.Some surfaces are actually better than others. So you may well encounter LPs that are silent even on an unstable phono section.
As a general rule of thumb, if you have to load a low output moving coil cartridge to get to sound right, the stability of the phono section is suspect.