Research and Special Purpose Power Tubes

Designed to be durable for particle accelerators, long-range search radars and other RF and pulsed RF applications

Durable construction
High emission, long life with economic operation
RF or Pulsed RF amplification
Wide variety of applications
Some double ended for better output


Photonis continues to manufacture a wide range of special purpose power tubes for research applications. Our tetrodes, triodes and cavities are integral parts of linear accelerator power sources in laboratories throughout the world. We manufacture our power tubes of research and special applications to custom specifications to ensure your research is accurate and reliable. Photonis offers pulsed RF amplifiers that include a wide selection of tubes, matching cavities and integral cavity modular amplifiers for pulsed RF service at frequencies up to 1400 MHz. These tubes feature anode, grid and drive pulsed ratings, pulse lengths to 2200 µsec, duty cycles to 25% and peak power to 8 megawatts. Phase stability and broadband capability makes these tubes ideal for applications ranging from linear-accelerator drives to fire-control radar. Our Series Regulators & Hard Tube Modulators feature sturdy, fault-resistant cathodes and clean, high voltage designs which make these types ideal for modulation and control of pulsed RF amplifiers, klystrons, TWTs and more in modern shaped-pulse and pulse width-controlled systems. Our tubes can support pulse currents up to 90 amperes along with hold-off voltages up to 200kV. Photonis also offers distributed amplifiers that are high gain, ceramic/metal tetrodes with dual input configuration. These tubes are specifically designed for distributed amplifier services up to 500 MHz. High gain, ceramic/metal tetrodes with matching cavities are available for use as pulsed RF sources in accelerator services. 

Power Tube Cavities

For many years, Photonis Defense has been developing specialized circuitry for power tubes, generally termed “cavities” as a result of customer demand. These cavities are complete RF circuits that are necessary to tune and operate a matching power tube. Each cavity is designed to match a specific tube in order to produce a final high-power amplifier stage for a specific frequency band and service. Each cavity is an essential part of the installation and maintenance operations needed for a Photonis Defense Power Tube. Photonis Defense highly recommends pairing one of our cavities with any recommended matching power tube and can work with you to determine which power tube cavity your application requires. Please contact us for more information.

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Type Number Power Peak (kW) Volts Amps G2 Volts Gain dB Pulsed Length (µsec) Duty Factory (%)
4616 250 (pulse) 30 27.0 1800 20 500 5
7835 5000 (pulse) 32 260 - 12 500 1.5
4617 5000 (pulse) 30 300 - 13 25 1
94402E 175 (pulse) 20 25 2000 20 125 1
4648 200 (cw) 20 10 1200 14 - -



Resource center

Are you looking for a specification sheet or paper? Documents like these and more are available in the Photonis Resource Center. 

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