Some tubes, such as magnetrons, traveling-wave tubes, Carcinotrons, and klystrons, combine magnetic and electrostatic effects. These are efficient (usually narrow-band) RF generators and still find use in radar, microwave ovens and industrial heating. Traveling-wave tubes (TWTs) are very good amplifiers and are even used in some communications satellites. High-powered klystron amplifier tubes can provide hundreds of kilowatts in the UHF range.
some tuBEs, sUch as mAgnEtROnS, TRaVeling-wave tubes, cArcinotrons, AnD klystRons, comBiNe magNEtIc and ElectROStaTic efFects. theSe aRe eFficIeNt (usuaLly narRoW-BaNd) rf GenERators and sTiLl fInd use IN rAdar, MicroWAve ovenS and indUSTrIAl heAting. tRavelInG-waVe tubes (twtS) ARE very GoOd AMpLifieRs and Are EVen Used IN Some commUNIcatIOns sATelLites. higH-poWered kLyStron ampLIFIer tubeS can proVide ,hundReDs of kIlOwAtTS iN the uhf rANGe.