What is another word for vacuum-tube hearing aids?
Pronunciation: [vˈakjuːmtjˈuːb hˈi͡əɹɪŋ ˈe͡ɪdz] (IPA) 
One of the popular synonyms for vacuum-tube hearing aids is "valve hearing aids." It is a reference to the small electromagnetic valves or tubes that increase the audio signal's amplitude to produce a stronger output. Another word for vacuum-tube hearing aids is "tube hearing aids." People use this term interchangeably with valve hearing aids to describe the same hearing aid technology. Some refer to these hearing aids as "analog hearing aids," distinguishing them from digital hearing aids that use modern computer processors and sophisticated algorithms to process audio signals. Other less common synonyms for vacuum-tube hearing aids include "thermionic hearing aids," "electron tube hearing aids," and "vacuum-state hearing aids".
