NO. that coil isn't for adjusting the horizontal osc. frequency at all.
It makes the picture more linear. In other words, If you look at a circle on your screen, and, picture is non linear, the circle may be egg shaped, or, jagged, instead of completely round. Now, this is only a simple example, but, I hope it works.
Now, the horizontal drive will adjust the amount of voltage the control grid on the horizontal output receives. That will also affect your hv, but, not the oscilator frequency. But, if voltage is pulled down too much it can also, now, mind you, I'm not saying will, but, can affect the horizontal osc. frequency because it's loading down the horizontal output, which in turn pulls more current, which in turn pulls down power supply voltage, which will affect the frequency....
You neded to go back to the horizontal osc. coil, and, follow the directions on proper adjustment of the horizontal oscilator.
Bill Cahill
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