Quote:
Originally Posted by Electronic M
The horizontal AFC is meant to compare the oscillator frequency to the synch, and pull the horizontal oscillator frequency to match the synch. If the horizontal AFC circuit is bad it can pull the horizontal oscillator waaaay off normal operating frequency. The horizontal AFC circuit comprises all tubes on the schematic that are between the synch tube and horizontal oscillator tube. Pulling the tubes in the AFC will disable it and make trouble shooting oscillator issues easier.
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Its a primitive type of phase lock loop.