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Claim 1

A RESONATOR STRUCTURE FOR USE WITH AN ULTRA HIGH FREQUENCY VACUUM TUBE WHICH HAS ANNULAR CATHODE, GRID, SCREEN AND ANODE CONTACT SURFACES ALL SPACED ALONG AN AXIS THEREOF, SAID RESONATOR STRUCTURE INCLUDING IN COMBINATION: A PLURALITY OF HOLLOW CYLINDRICAL CONDUCTIVE MEMBERS COAXIALLY POSITIONED WITH RESPECT TO ONE ANOTHER AND POSITIONED TO RECEIVE THE VACUUM TUBE AT A FIRST END THEREOF IN COAXIAL RELATIONSHIP THEREWITH AND TO ESTABLISH RESPECTIVE ELECTRICAL CONTACTS WITH SAID ANNULAR CONTACT SURFACES THEREOF; SAID HOLLOW CYLINDRICAL MEMBERS RESPECTIVELY FORMING A SCREEN-ANODE RESONATOR, A SCREEN-GRID RESONATOR AND A GRID-CATHODE RESONATOR; THE ONE OF SAID HOLLOW CYLINDRICAL CONDUCTIVE MEMBERS FORMING SAID SCREEN-GRID RESONATOR EXTENDING FROM SAID FIRST END OF SAID PLURALITY OF CONDUCTIVE MEMBERS ALONG A PART ONLY OF THE LENGTH OF THE OTHERS OF SAID CONDUCTIVE MEMBERS; AND A PLURALITY OF ANGULARLY POSITIONED FEEDBACK PROBES MOUNTED ON A SECOND OF SAID CYLINDRICAL MEMBERS AND AXIALLY SPACED FROM SAID FIRST END OF SAID PLURALITY BEYOND THE SECOND END OF SAID ONE OF SAID CYLINDRICAL MEMBERS AND EXTENDING RADIALLY FROM SAID GRID-CATHODE RESONATOR INTO SAID SCREEN-ANODE RESONATOR TO PROVIDE FEEDBACK BETWEEN SAID SCREEN-ANODE RESONATOR AND SAID GRID-CATHODE RESONATOR.