A microwave system (200, 300), comprising: a solid-state generator (202, 302, 303, 402, 502, 504, 700, 702, 800, 900) for generating microwave energy characterized by one or more parameters, the solid-state generator having at least one control input (201, 301A, 301B, 401, 501A, 501B) for receiving a control signal to vary electrically the one or more parameters of the microwave energy; a microwave load (232 332) for receiving the microwave energy and producing an effect in response to the microwave energy; a microwave conducting element for coupling the microwave energy to the microwave load; an impedance match adjusting device (230, 330, 406) coupled to the microwave conducting element to vary at least one of the one or more parameters of the microwave energy; and a controller for generating the control signal to vary one or more parameters of the microwave energy; wherein the solid-state generator comprises: (i) a plurality of microwave amplifiers (804, 808, 904) with independently controllable amplitude, each of the microwave amplifiers generating one of a respective plurality of amplified microwave signals and (ii) a microwave combiner (710, 810 906), receiving the plurality of amplified microwave signals and combining the plurality of amplified microwave signals into a single combined microwave signal and applying the single combined microwave signal as the microwave energy to the microwave load, and the effect produced in response to the microwave energy is altered by both electrical variation of the one or more parameters of the microwave energy via the control signal and adjustment of the impedance match adjusting device to vary the at least one or more parameters of the microwave energy, characterized in that the solid-state generator further comprises: (iii) a plurality of frequency synthesizers (902A, 902B, 902C, 902D), each of the plurality of frequency synthesizers generating a microwave output signal with independently controllable frequency and/or phase, each of the microwave output signals being applied to a respective one of the plurality of microwave amplifiers (904A, 904B, 904C, 904D). a solid-state generator (202, 302, 303, 402, 502, 504, 700, 702, 800, 900) for generating microwave energy characterized by one or more parameters, the solid-state generator having at least one control input (201, 301A, 301B, 401, 501A, 501B) for receiving a control signal to vary electrically the one or more parameters of the microwave energy; a microwave load (232 332) for receiving the microwave energy and producing an effect in response to the microwave energy; a microwave conducting element for coupling the microwave energy to the microwave load; an impedance match adjusting device (230, 330, 406) coupled to the microwave conducting element to vary at least one of the one or more parameters of the microwave energy; and a controller for generating the control signal to vary one or more parameters of the microwave energy; wherein the solid-state generator comprises: (i) a plurality of microwave amplifiers (804, 808, 904) with independently controllable amplitude, each of the microwave amplifiers generating one of a respective plurality of amplified microwave signals and (ii) a microwave combiner (710, 810 906), receiving the plurality of amplified microwave signals and combining the plurality of amplified microwave signals into a single combined microwave signal and applying the single combined microwave signal as the microwave energy to the microwave load, and (i) a plurality of microwave amplifiers (804, 808, 904) with independently controllable amplitude, each of the microwave amplifiers generating one of a respective plurality of amplified microwave signals and (ii) a microwave combiner (710, 810 906), receiving the plurality of amplified microwave signals and combining the plurality of amplified microwave signals into a single combined microwave signal and applying the single combined microwave signal as the microwave energy to the microwave load, and the effect produced in response to the microwave energy is altered by both electrical variation of the one or more parameters of the microwave energy via the control signal and adjustment of the impedance match adjusting device to vary the at least one or more parameters of the microwave energy, characterized in that the solid-state generator further comprises: (iii) a plurality of frequency synthesizers (902A, 902B, 902C, 902D), each of the plurality of frequency synthesizers generating a microwave output signal with independently controllable frequency and/or phase, each of the microwave output signals being applied to a respective one of the plurality of microwave amplifiers (904A, 904B, 904C, 904D).