Frame flyback blanking for Bush TV22.
The Bush TV22 doesn't have frame flyback blanking and users of this set mention that that the retrace lines do often appear on light scenes and program intervals.
It should be possible to add frame flyback suppression to the Bush TV22.
The attachment shows the method used to perform flyback blanking in other Bush TV receivers. The circuit shown in the attachment is from the models TV33, TV36C and TV43.
Only two additional components are required, a 100Kohm resistor and a 0.002uF capacitor.