What is "tubaphone"

A tubaphone (or tubuphone) is a type of metallophone constructed from a series of metal tubes arranged in a keyboard configuration. The tubes are similar in length to that of a xylophone, and sound vaguely like a Glockenspiel.

A Tu-ba-Phone, or Tubaphone', is also a model of banjo that was made by the Vega company, and the tone ring design used in it. Modern makers continue to use tubaphone tone rings, among other tone ring designs.