What is another word for thermionic tubes?
Pronunciation: [θˌɜːmɪˈɒnɪk tjˈuːbz] (IPA) 
Thermionic tubes, also known as vacuum tubes, have been largely replaced by modern solid-state electronics, but they still hold historical and nostalgic value for some audiophiles and musicians. Some synonyms for thermionic tubes include electron tubes, valve tubes, or simply tubes. They were commonly used in early radios, television sets, and amplifiers and were known for their warm, smooth sound. Other terms used to describe thermionic tubes include vacuum valves, electron valves, and cathode ray tubes. Despite being largely replaced by modern technology, thermionic tubes remain popular in some areas, including certain audio recording studios and guitar amplifiers.
