Television receivers

In a small, portable, battery operated television receiver having an electrostatically focussed and deflected cathode ray display tube, distortion of the display resulting from changes in the battery voltage as the battery becomes discharged are reduced by deriving all focusing and deflection voltages applied to the tube directly from the battery without stabilisation or regulation. The voltages for the tube are derived from the battery in such ways that they are proportional to the battery voltage and therefore the relationships between them are substantially maintained. The heater of the cathode ray tube may be supplied via a transformer energised by the battery voltage switched at line frequency and the line frequency pulses applied to the heater so as to cut off the beam during line flyback. The invention may be applied to cathode ray tube displays having sources other than a battery, whilst retaining the advantage of power saving resulting from the omission of voltage regulation circuitry.