electrophone
/ɪˈlɛktrə(ʊ)fəʊn/noun
1An instrument which produces sounds in response to an electric current, e.g. from an induction coil or telephone, especially as developed to enable telephone subscribers to hear concerts, plays, public speeches, etc., in their home. Now historical.
2Any musical instrument in which sound is electronically generated or amplified.
Origin
Mid 19th century. From electro- + -phone. Compare earlier electrophonic.