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Hi Carl,
I saw one other set with a 12 channel tuner conversion. It was installed so nicely that it had to have been done with a factory conversion kit.
The 12 channel tuner has a normal concentric fine tuning knob like a more modern set. The row of channel lights is disabled when that is installed.
The original sets did not have fine tuning, and that must be how yours is.
Some sets got modified with a factory provided conversion kit to provide an AFC circuit with a potentiometer for fine tuning, which was a concentric knob with the contrast control. Mine has that.
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