RPC "Istok" is developing and producing power traveling-wave tubes (TWTs) on a chain of coupled resonators (CCR) - wide-band vacuum microwave devices with power level up to several dozens of kilowatts used in far-range, tropospheric and space communications systems. The use of a slow-wave structure of interdigital type and unified magnetic system in TWTs allowed to reduce the weight of devices by a factor of 2.5. For connected systems operating in a wide frequency band (up to 40%) in the mode of simultaneous amplification of a great number of signals a helix CW TWT with output power 1.2 kW has been developed