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Telefunken Analog and Hybrid Computers
A 57-page illustrated presentation by Bernd Ulmann (April 2006) tracing the complete history of Telefunken analog and hybrid computers from the 1955 tube-based prototype through the late-1970s RA770. Covers computing elements, circuit design choices (drift compensation, parabola multipliers), and successive production machines including the RA463, RAT700, RA770, RA775, RA800H, and the HKW900 hybrid coupler unit. Intended as a historical survey and preservation appeal, with photographs of surviving hardware and references to primary Telefunken documentation.
analog computer historyhybrid computersTelefunkenvacuum tube computers