Transistor modulator-amplifier

Claim 1

A MODULATOR AMPLIFIER CIRCUIT COMPRISING: (A) FIRST AND SECOND TRANSISTORS, SAID FIRST AND SECOND TRANSISTORS EACH HAVING AN EMITTER, COLLECTOR AND BASE ELECTRODE; (B) A FIRST SOURCE OF ALTERNATING SIGNALS; (C) AN INPUT TRANSFORMER HAVING A PRIMARY WINDING AND FIRST AND SECOND SECONDARY WINDINGS, EACH OF SAID WINDINGS HAVING TWO TERMINALS, SAID FIRST AND SECOND SECONDARY WINDINGS BEING WOUND TO PRODUCE AN IN PHASE SIGNAL AT ONE TERMINAL THEREOF WHEN THE FIRST SOURCE OF ALTERNATING SIGNAL IS CONNECTED TO SAID INPUT TRANSFORMER PRIMARY WINDING; (D) MEANS CONNECTING SAID FIRST SOURCE OF ALTERNATING SIGNAL TO SAID INPUT TRANSFORMER PRIMARY WINDING; (E) CONDUCTOR MEANS CONNECTING SAID ONE TERMINALS OF THE FIRST AND SECOND SECONDARY WINDINGS TO THE BASE ELECTRODES OF SAID FIRST AND SECOND TRANSISTORS RESPECTIVELY; (F) BIASING MEANS, SAID BIASING MEANS BEING ADJUSTABLE TO PROVIDE FOR INDEPENDENT VARIATION OF EACH OF SAID FIRST AND SECOND TRANSISTORS IN THE QUIESCENT RANGE OF OPERATION THEREOF; (G) CONDUCTOR MEANS CONNECTING SAID BIASING MEANS TO THE OTHER TERMINALS OF THE FIRST AND SECOND SECONDARY WINDINGS; (H) AN OUTPUT TRANSFORMER HAVING A PRIMARY AND A SECONDARY WINDING, SAID PRIMARY WINDING BEING OF THE CENTER TAP TYPE; (I) CONDUCTOR MEANS CONNECTING OUTPUTS FROM THE COLLECTOR ELECTRODES OF SAID FIRST AND SECOND TRANSISTORS TO THE ENDS OF THE OUTPUT TRANSFORMER PRIMARY WINDING; (J) A POWER SUPPLY MEANS CONNECTED TO THE CENTER TAP OF SAID OUTPUT TRANSFORMER PRIMARY WINDING, SAID POWER SUPPLY MEANS INCLUDING A STABILIZING THERMISTOR NETWORK CONNECTED THERETO TO PREVENT UNDESIRED VARIATIONS IN THE CIRCUIT DUE TO EXTERNAL TEMPERATURE VARIATIONS; (K) MEANS FOR CONNECTING THE EMITTER ELECTRODES OF SAID FIRST AND SECOND TRANSISTORS TO A COMMON GROUND; (L) A SECOND SOURCE OF SIGNALS CONNECTED DIRECTLY TO SAID BIASING MEANS, WHEREIN ANY VARIATION IN SAID SECOND SOURCE OF SIGNAL VARIES THE OUTPUT APPEARING IN THE OUTPUT TRANSFORMER SECONDARY WINDING; AND (M) A FEEDBACK CIRCUIT CONNECTED BETWEEN SAID OUTPUT TRANSFORMER SECONDARY WINDING AND SAID BASE ELECTRODES OF THE FIRST AND SECOND TRANSISTORS, WHEREIN A PORTION OF SAID OUTPUT IS FED BACK TO SAID BASE ELECTRODES.