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  1. B

    Alpha 374 amplifier

    alpha 374 with three 8874 tubes convert to 3 4cx800 any information about this conversion and its performance.
  2. B

    Continuous tuning amplifiers

    I was listening to a Old ham operator who has been a ham since 1970 talking about all of his amplifiers are continuous tuning no matter what band it will turn to it. For instance if they create another band he will be able to tune his amplifier without doing any modifications. I have never heard...
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