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DECLINING TECHNOLOGY

To the editor:

I was astonished by the concern expressed by Jack Browne in regard to the decline of vacuum-tube technology in his November 1999 editorial (p. 17). That editorial reveals how truly out of touch Jack Browne is with today's world of microwave systems. The reason for the decline in vacuum-tube technology is that solid-state devices can, in most cases, provide the same system-level capability as tubes, but with the real advantages of lower voltages, higher reliability, lower life-cycle cost, increased personnel safety, etc. For example, older radars with megawatt (peak-power) transmitters employed very-low duty-factor waveforms, producing average-power ...

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