Answer: vacuumtube

AnswerCrossword Clue
VACUUMTUBEOld radio component
VACUUMTUBEOld radio part
VACUUMTUBEComponent of early computers
VACUUMTUBEPart of an old TV
VACUUMTUBETransistor predecessor
VACUUMTUBEOld-time radio part