control and high gain, it had been at the expense of not being able to utilize the buck-boost coil for amplitude control. Both amplitude and phase control will be necessary in matching the two magnetron amplifiers into the Magic T so that there will be a minimum of power reflected back to the drive sources. And separate amplitude control for all magnetrons in the large transmitter is also needed for overall system control. In the “new” conceptual design it is therefore proposed that a magnetron with a voice coil actuated mechanical tuner be used. Its time response would be similar to that of the buck-boost coil, its life should be very good, and in the environment of space it should be free from vibration-induced microphonics. And there is a precedent in the design of magnetrons with voice coil driven mechanical tuners. The
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