(under subclass 181) Subject matter wherein the series coupling D.C.. conductive path between the output electrode of the preceding amplifying device and the input electrode of the following amplifying device contains therein a reactive element, such as an inductor or parallel to a D.C.. conductive element in the series path there is a capacitive reactive element.
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53+, for amplifiers with distributed parameter coupling which may involve a D.C.. conductive path including a reactive element.
107, for signal feedback amplifiers having a phase shift
network in the loop path.
121, for push-pull amplifiers having D.C.. interstage coupling including any with series reactor element.
143, for amplifiers having a thermally responsive impedance. 144+, for amplifiers having a variable impedance in the signal path controlled by a separate control path.
166, for transformer coupled amplifier stages including a D.C.. reactive element (inductor coil) jointing the primary and secondary windings.
175, for amplifiers having a lattice or Wheatstone bridge network in the interstage coupling circuit.
176, for amplifiers having a T, H, or Pi network in the interstage coupling.
302+, for semiconductor amplifiers having frequency responsive means in the signal transmission path.
