TIMEBASE CIRCUITS
Every picture-tube must have a means of deflecting its scanning spot to all parts of the screen or target. Except in oscilloscope displays the electron beam is deflected by magnetic fields in the neck of the tube. These are generated by deflection coils wound on a ferrite former and securely fitted to the tube neck. One pair of coils is used for vertical spot deflection, and between them make horizontal lines of magnetic flux in the tube neck: these deflect the beam vertically, in a direction determined by the polarity of the flux lines, and to a degree proportional to the intensity (or number of lines) of flux. For horizontal deflection of the electron beam a second pair of coils is used, this time generating
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