Transistor deflection system

Claim 1

A DEFLECTION SYSTEM FOR PRODUCING A SAWTOOTH CURRENT WAVE IN A DEFLECTION COIL COMPRISING A TRANSISTOR OUTPUT AMPLIFIER INCLUDING FIRST AND SECOND ELECTRODES FORMING AN INPUT CIRCUIT, SAID OUTPUT AMPLIFIER FURTHER COMPRISING AN OUTPUT CIRCUIT COUPLED TO SAID DEFLECTION COIL, A CHARGE NETWORK COMPRISING THE SERIES COMBINATION OF A CAPACITOR AND A CHARGING IMPEDANCE FOR SUPPLYING A SAWTOOTH DRIVE VOLTAGE TO SAID OUTPUT AMPLIFIER, MEANS PROVIDING A DIRECT CURRENT COUPLING FROM SAID CHARGE NETWORK TO SAID FIRST ELECTRODE, A DISCHARGE CIRCUIT FOR PERIODICALLY DISCHARGING SAID CAPACITOR COMPRISING A SEMICONDUCTOR OSCILLATOR STAGE HAVING A DIRECT CURRENT CONNECTION TO SAID CHARGE NETWORK, SAID DISCHARGE CIRCUIT PRODUCING A SMALL RESIDUAL VOLTAGE OF A POLARITY WHICH TENDS TO PRODUCE CONDUCTION IN SAID OUTPUT AMPLIFIER, AND MEANS FOR COMPENSATING SAID RESIDUAL VOLTAGE SO AS TO PRODUCE CUT-OFF OF SAID OUTPUT AMPLIFIER DURING THE FLYBACK PERIOD OF THE SAWTOOTH WAVE COMPRISING A RESISTOR CONNECTED IN SERIES WITH SAID CHARGING CAPACITOR AND INCLUDED IN SAID DISCHARGE CIRCUIT AND A RESISTANCE-CAPACITANCE NETWORK COUPLED TO SAID SECOND ELECTRODE SO AS TO SUPPLY A SUBSTANTIALLY CONSTANT DIRECT CURRENT VOLTAGE THERETO.