If there was hum, it would be rather loud possibly overpowering the audio. It would be very obvious from the next room. What you have is completely normal and may not be able to be adjusted out. You can spend hours trying to adjust things but it will never be perfect. It's kind of like convergence trying to get that last bit out. The audio quality sounded pretty good to me. Even some newer sets will have some buzz if you listen close enough.
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