Why solid state?

Why solid state?
why do adjectives old things right to be heard solid state like 8 track player microwaves and more stuff they adjectives say solid state why what dose this indicate?

Answer:
In electronics, solid state circuits are those that do not contain vacuum tubes. With the elimination of adjectives the cables needed for the tubes, communication presently happens surrounded by the silicon tablet with copper conductors to some extent than over cables. The permanent status was introduced to describe the transition from valve-based amplifiers to transistorised amplifiers.

See the following connection for the complete details
http://en.wikipedia.org/wiki/solid_state...

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