Converter stage in which oscillator tuned circuit also serves as output load impedance for rf stage

Claim 1

IN COMBINATION: (A) A FIRST TRANSISTOR CIRCUIT ARRANGED TO AMPLIFY A RADIO FREQUENCY SIGNAL, (B) A SECOND TRANSISTOR CIRCUIT ARRANGED TO PROVIDE A LOCAL OSCILLATOR SIGNAL AND HETERODYNE THEREWITH THE AMPLIFIED RADIO FREQUENCY SIGNAL SUPPLIED BY SAID FIRST TRANSISTOR CIRCUIT, SAID SECOND TRANSISTOR CIRCUIT INCLUDING A SIGNAL FEEDBACK CIRCUIT FOR PROVIDING SAID LOCAL OSCILLATIONS, SAID FEEDBACK CIRCUIT INCLUDING A TRANSFORMER CIRCUIT TUNED TO THE FREQUENCY OF SAID LOCAL OSCILLATOR SIGNAL, SAID TURED TRANSFORMER CIRCUIT ALSO SERVING AS AN OUTPUT LEAD IMPEDANCE FOR SAID FIRST TRANSISTOR CIRCUIT, ONE WINDING OF SAID TRANSFORMER HAVING A FIRST CAPACITOR IN SERIES THEREWITH, SAID SERIES-CONNECTED TRANSFORMER WINDING AND SAID FIRST CAPACITOR BEING PARALLELED BY A SECOND CAPACITOR.