Abstract :
THE advent of television emphasized the need for a power-amplifier tube capable of delivering kilowatts of power into wide-band circuits at carrier frequencies above 40 megacycles. To obtain such output with wide-band circuits, a low output capacitance and consequently a small anode area are required. The result is high current and high dissipation per unit area. For satisfactory operation at high frequencies, the electron transit time must be small, necessitating small interelectrode spacings. These requirements are interrelated and in some measure conflicting.
