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Phil,
Question 1 - Yes it's a manual RF/IF gain control
Question 2 - At one end of the control it will cutoff the signal and you will just see a blank raster/dark screen. At the opposite end you may start overloading the set (gain full up), this all depends on the signal level you are putting into the set. Best setting I have found is to turn the control up until you see the picture start to tear or lose sync then back it down until picture is clear and stable. Again depending on signal levels it may never breakup.
Chuck
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