A multi-beam triode for RF amplification has plurality of electron beams generated by a thermionic cathode, each electron beam travelling through an associated grid and to a common anode electrode. An input RF energy is coupled to a grid support which is electrically common to a control grid of each electron beam, and RF is coupled out of the gridanode gap, with suitable input RF matching cavities and output RF matching cavities provided.

A multi-beam triode for RF amplification has plurality of electron beams generated by a thermionic cathode, each electron beam travelling through an associated grid and to a common anode electrode. An input RF energy is coupled to a grid support which is electrically common to a control grid of each electron beam, and RF is coupled out of the gridanode gap, with suitable input RF matching cavities and output RF matching cavities provided.

An electron emitter device is provided comprising a cathode comprising a conductive transition metal perovskite oxide comprising mobile conducting electrons exhibiting a conductivity of at least 10.sup.6 .sup.1-cm.sup.1 at room temperature, the transition metal perovskite oxide having a surface from which the mobile electrons are induced to emit upon receiving sufficient energy from an energy source; and an anode electrically coupled to the cathode and positioned to define an interelectrode conductive region between the anode and the cathode, onto which anode the emitted electrons are collected. The transition metal perovskite oxide may have formula Sr.sub.1-xBa.sub.xVO.sub.3. Related methods and devices based on the electron emitter device are also provided.

An electron emitter device is provided comprising a cathode comprising a conductive transition metal perovskite oxide comprising mobile conducting electrons exhibiting a conductivity of at least 10.sup.6 .sup.1-cm.sup.1 at room temperature, the transition metal perovskite oxide having a surface from which the mobile electrons are induced to emit upon receiving sufficient energy from an energy source; and an anode electrically coupled to the cathode and positioned to define an interelectrode conductive region between the anode and the cathode, onto which anode the emitted electrons are collected. The transition metal perovskite oxide may have formula Sr.sub.1-xBa.sub.xVO.sub.3. Related methods and devices based on the electron emitter device are also provided.

An electron emitter device is provided comprising a cathode comprising a conductive transition metal perovskite oxide comprising mobile conducting electrons exhibiting a conductivity of at least 10.sup.6 .sup.1-cm.sup.1 at room temperature, the transition metal perovskite oxide having a surface from which the mobile electrons are induced to emit upon receiving sufficient energy from an energy source; and an anode electrically coupled to the cathode and positioned to define an interelectrode conductive region between the anode and the cathode, onto which anode the emitted electrons are collected. The transition metal perovskite oxide may have formula Sr.sub.1-xBa.sub.xVO.sub.3. Related methods and devices based on the electron emitter device are also provided.

An electron emitter device is provided comprising a cathode comprising a conductive transition metal perovskite oxide comprising mobile conducting electrons exhibiting a conductivity of at least 10.sup.6 .sup.1-cm.sup.1 at room temperature, the transition metal perovskite oxide having a surface from which the mobile electrons are induced to emit upon receiving sufficient energy from an energy source; and an anode electrically coupled to the cathode and positioned to define an interelectrode conductive region between the anode and the cathode, onto which anode the emitted electrons are collected. The transition metal perovskite oxide may have formula Sr.sub.1-xBa.sub.xVO.sub.3. Related methods and devices based on the electron emitter device are also provided.