Cathode-ray tube apparatus

A cathode-ray tube apparatus comprising:

• a face with a phosphor screen formed on an inner surface;
• a funnel connected to the face;
• an electron gun housed in a neck of the funnel;
• a deflection yoke for deflecting an electron beam emitted from the electron gun in a horizontal direction and a vertical direction, provided on an outer circumferential surface of the funnel;
• a plurality of magnet rings for correcting a convergence, placed in a tube axis direction on an outer circumferential surface of the neck;
• at least one spacer placed between the magnet rings placed in the tube axis direction;
• and
• a velocity modulation coil for modulating a scanning velocity in the horizontal direction of the electron beam, provided so that a position of the velocity modulation coil in the tube axis direction is overlapped with those of the magnet rings,
• wherein at least one of the spacers is made of a magnetic substance, and an outermost surface in a radius direction of the spacer made of a magnetic substance is covered with a non-metallic material.