The term FUBES is the plural of fube. A FUBE is a replacement for a vacuum tube, using FET technology. If you plugged in a fube for a tube, the circuit might work better, but usually not. The fube was invented by engineers at National Semiconductor Corp in the 1960s, but never made any business or profit.
Note – if anyone out there can confirm or offer additional information on National Semiconductor and FUBES it woudl be greatly appreciated.
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