Before revision: It could be voltage-tuned over an 8.2 - 12.4 GHz range and required a supply voltage of 600 V. Backward wave oscillator at Stockholm University operating in the terahertz range|alt= A backward wave oscillator (BWO), also called backward wave tube, is a vacuum tube that is used to generate microwaves up to the terahertz range.
After revision: carcinotron orIt could be voltage-tuned over an 8.2 - 12.4 GHz range and required a supply voltage of 600 V. Backward wave oscillator at Stockholm University operating in the terahertz range|alt= A backward wave oscillator (BWO), also called backward wave tube, is a vacuum tube that is used to generate microwaves up to the terahertz range.