Before revision: The gain of klystrons can be high, 60 dB (an increase in signal power by a factor of one thousand) or more, with output power up to tens of megawatts, but the bandwidth is narrow, usually a few percent although it can be up to 10% in some devices.
After revision: The gain of klystrons can be high, 60 dB (an increase in signal amplitude by a factor of one thousand) or more, with output power up to tens of megawatts, but the bandwidth is narrow, usually a few percent although it can be up to 10% in some devices.