Yokes, what's the difference?

[Don Lindsly]

The yoke is wound to achieve the desired deflection angles, both vertical and horizontal. You will notice the difference between a 90 and 70 degree yoke.

The second consideration is impedance. The yoke must match, or at least be close, to the design impedance of the flyback and vertical output transformer. That assures maximum energy transfer from the output circuits to the yoke. A mismatch will show up as non linearity, drive lines and/or distortion.

The third is the available output stage power. A 90 degree yoke will not always deliver enough width and height without the additional power necessary to sweep the sharper angle.

There is some consistency within manufacturers, but not always. It is best to match the correct yoke and only use a substitute for testing.