Solid-state conversion of a tube-type communications receiver
Steussy, James Michael
Rothauge, Charles H.
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A Hammarlund SUPER-PRO SP-210 communications receiver of approximately 1940 design was rebuilt using modern solid-state components and associated circuitry in replacement of the original eighteen vacuum tubes. Replacement was effected in a stage- for-stage manner so as to utilize, wherever practicable, the original system of operation and particularly the existing tuned circuits for which the receiver was famous. The project goals were to gain experience in the applications of classroom theory to practical electronics, to observe the problems associated with both vacuum tube and solid-state circuitry, and to provide a starting point for continued research in electronics.