Color display system with color cathode ray tube having a high breakdown voltage

A color display system including a color cathode ray tube comprising:

• an evacuated envelope including
• a panel which carries a phosphor screen,
• a glass neck which houses an electron gun mount assembly,
• a funnel connecting said faceplate panel and said glass neck,
• and a stem having a circular array of a plurality of leads therethrough sealed to and closing said neck at an end thereof;
• and
• an electron gun mount assembly,
• said electron gun mount assembly being supported on said stem via said plurality of leads and comprising
• a cathode for generating an electron beam and directing it toward said phosphor screen,
• a beam control grid electrode,
• an accelerating electrode,
• at least two focusing electrodes, one of said at least two focusing electrodes being adapted to be supplied with a voltage varying in accordance with an amount of deflection of said electron beam,
• an anode electrode, and
• a heater for heating said cathode;
• one of two terminals of said heater and said beam control grid electrode being electrically connected to a common one of said plurality of leads for being supplied with a variable voltage for beam control;
• the other one of said two terminals of said heater being electrically connected to another one of said plurality of leads and adapted to be supplied with a sum of said variable voltage for beam control and a voltage for heating said cathode;
• and
• spacings between focus-voltage leads of said plurality of leads connected to said at least two focusing electrodes and leads adjacent thereto being larger than spacings between leads of said plurality of leads excluding said focus-voltage leads.