New tube and circuit for the new 900-MHz communication band

The paper describes the solutions to the problems of obtaining satisfactory levels of power in the now available high-frequency (900 MHz) mobile, communication band. A major step was to redesign the coaxially structured beam power tube 8072, the low-frequency standard in the communication field, to use high-frequency, low-inductance, coaxial base in place of the pin connections. This change permitted a substantial increase in frequency and maintained the linearity of the tube transfer characteristics while assuring economic manufacturing capability.