FI-MainGroup/Facet-Choice

  • H03F1/00
  • Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements HB CC 5J500
  • H03F3/00
  • Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements HB CC 5J500
  • H03F5/00
  • Amplifiers with both discharge tubes and semiconductor devices as amplifying elements HB CC 5J068
  • H03F7/00
  • Parametric amplifiers [2006.01] HB CC 5J067
  • H03F9/00
  • Magnetic amplifiers HB CC 5J068
  • H03F11/00
  • Dielectric amplifiers HB CC 5J068
  • H03F13/00
  • Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier HB CC 5J068
  • H03F15/00
  • Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect HB CC 5J068
  • H03F17/00
  • Amplifiers using electroluminescent element or photocell HB CC 5J068
  • H03F19/00
  • Amplifiers using superconductivity effects HB CC 5J068
  • H03F99/00
  • Subject matter not provided for in other groups of this subclass [2009.01] HB CC 5J068
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