Are purely-analog audio devices immune to aliasing?

Hi:

Is it true that purely-analog audio devices [such as analog cassette, AM 
radio, and the pre-digital telephone systems*] are immune to aliasing?

*By pre-digital telephone systems, I am referring to how these systems 
operated prior to using digital technology. Nowadays, many analog phone 
systems do use DSP somewhere along the line. Similar applies to the 
analog AM radio, it used to be just analog but now it utilizes some 
amount of DSP indirectly.


Thanks,

Radium