In the actual circuit, the horizontal pincushion correction circuit works similarly to the vertical pincushion correction circuit, and is corrected by a magnetic saturation transformer. Here, the correction principle is briefly introduced by taking the horizontal pincushion correction circuit in the CS37-2 color TV as an example. As shown in Figure 8 - 31.
T502 is a horizontal pincushion 
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The correction principle of the pincushion correction circuit is as follows: When no AC signal is applied, the 17V power supply passes through the R427 and R423 to pass the T502 primary through a direct current, so that the T502 is in a semi-magnetic saturation state. When the primary field has a sawtooth voltage, the parabolic current flows through the T502 primary to make the T502 magnetically saturated, so that the secondary inductance of the T502 decreases, and the amplitude of the branch deflection current iYH increases. The primary parabolic component current flows exactly at the midpoint of the field scan sawtooth voltage. At this point, the secondary inductance of T502 decreases the most, which makes the amplitude of iYH at this time maximum. Thus, Figure 8-30(b) is obtained. The amplitude of the line is deflected by the current iYH. This is equivalent to field rate parabola modulation of horizontal frequency sawtooth waves.
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