US PATENT SUBCLASS 330 / 90
.~.~ Combined with diverse-type feedback coupling

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

75  DF  SIGNAL FEEDBACK {20}
87  DF  .~ Cathode impedance feedback {4}
90.~.~ Combined with diverse-type feedback coupling {2}
91  DF  .~.~.~> Diverse feedback to or from cathode {1}
93  DF  .~.~.~> Including positive feedback

DEFINITION

Classification: 330/90

(under subclass 87) Subject matter combined with a type of signal feedback as defined in subclass 75, which is diverse from the type of feedback defined in subclass 87.