Direct coupled negative feedback hybrid amplifier

Claim 1

AN AMPLIFIER COMPRISING A PENTODE VACUUM TUBE INCLUDING A CATHODE, A CONTROL GRID, A SCREEN GRID, A SUPPRESSOR GRID AND AN ANODE, FIRST AND SECOND TRANSISTORS EACH INCLUDING A BASE, A COLLECTOR, AND AN EMITTER, SAID FIRST TRANSISTOR BEING CONNECTED IN A COMMON COLLECTOR AMPLIFIER CIRCUIT, SAID SECOND TRANSISTOR BEING CONNECTED IN A COMMON EMITTER AMPLIFIER CIRCUIT, A GROUND CONNECTION COMMON TO SAID TUBE AND SAID TRANSISTORS, SAID TUBE BEING CONNECTED IN A COMMON CATHODE AMPLIFYING CIRCUIT WITH THE INPUT APPLIED BETWEEN GRID AND GROUND AND INCLUDING INDIVIDUAL RESISTORS CONNECTING THE SCREEN AND ANODE TO A SOURCE OF POSITIVE POTENTIAL, A DIRECT CONNECTION BETWEEN SAID ANODE AND THE BASE OF SAID FIRST TRANSISTOR, A DIRECT CONNECTION BETWEEN THE EMITTER OF SAID FIRST TRANSISTOR AND THE BASE OF SAID SECOND TRANSISTOR, A VOLTAGE DIVIDER COMPRISING A FIRST RESISTOR, A FIRST CAPACITOR AND A SECOND RESISTOR SERIALLY CONNECTED IN THAT ORDER FROM THE COLLECTOR OF SAID SECOND TRANSISTOR TO GROUND, A DIRECT CONNECTION FROM SAID CATHODE TO THE JUNCTION OF SAID FIRST RESISTOR AND SAID FIRST CAPACITOR, AND A SECOND CAPACITOR CONNECTED BETWEEN SAID SCREEN GRID AND SAID CATHODE.