High ratio vacuum tube input transformer

Claim 1

A HIGH RATIO VACUUM TUBE INPUT TRANSFORMER COMPRISING: AN OPEN ENDED CUP-SHAPED SINGLE TURN PRIMARY WINDING HAVING A SUBSTANTIALLY SOLID CENTER PROJECTION AND A SOLID SIDE WALL TAPERED AT THE INSIDE OF THE UPPERMOST PORTON, A SOLID COVER PLATE HAVING A TAPERED PERIPHERAL PORTION CONFORMING TO SAID SIDE WALL AND HELD WEDGED IN TIGHT ELECTRICAL CONTACT WITH THE SAID WALL AND BEING ELECTRICALLY INSULATED FROM THE CENTER PROJECTION, SAID PRIMARY WINDING AND SAID COVER PLATE FORMING A TOROIDAL SHAPED CAVITY OF CONDUCTIVE SOLID MATERIALS AND HAVING AN OHMIC RESISTANCE IN THE ORDER OF 1 MILLIOHM WHEREBY THE ATTENUATION OF FREQUENCIES BELOWE 400 CYCLES IS REDUCED, SAID SOLID SIDE WALL AND SOLID COVER PLATE BEING ABSORBTIVE TO EDDY CURRENTS WHEREBY CURRENTS INDUCED IN THE PRIMARY HAVING FREQUENCIES ABOVE 2000 CYCLES PER SECOND ARE ABSORBED AS EDDY CURRENTS, A PAIR OF INPUT TERMINALS CONNECTED TO SAID COVER PLATE AND TO SAID CENTER PROJECTION RESPECTIVELY, A TOROIDAL SHAPED HIGHLY PERMEABLE CORE, A MULTI-TURN SECONDARY WINDING ENCIRCLING SAID MAGNETIC CORE, SAID MAGNETIC CORE AND SAID SECONDARY WINDING BEING ENCLOSED COMPLETELY WITHIN THE CAVITY, AND SHIELDED FROM HIGH FREQUENCY CURRENTS BY THE PRIMARY WINDING AND COVER PLATE, A PAIR OF OUTPUT TERMINALS, AND MEANS CONNECTED TO SAID SECONDARY WINDING AND SAID PAIR OF OUTPUT TERMINALS FOR CONDUCTING THE VOLTAGE OF SAID SECONDARY WINDING TO SAID OUTPUT TERMINALS.