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One other important connector on the tuner is the IF output. It will be a shielded cable with most likely an RCA style plug on the end of it. So you have four connections on the tuner: IF output, filament, B+ and AGC. If the Sams is new enough, all of the connections will appear in the upper lefthand corner of the schematic.
The motorized tuner mechanism is completely separate from these tuner connections.
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