Bob- Part of the explanation I read was that Seiko and several other mfgrs ( some major- see the link) no longer have QAM tuner in their TV's because "In the future, most cable providers will require a dedicated cable box to receive their signal". More details about individual TV manufacturers here:
https://intranet.brenau.edu/wp-conte...al_tv_faq2.pdf
If the cable Co. requires a box you can't receive it without the box...regardless of tuner