Thanks. I now have a new HD cable box and a cheap Sony upscaling player on another TV. I will try the HDMI to DVI adaptor with each to see how the picture compares. I can then go from there.

Ultimately, I probably need to upgrade TV's.
_________________________
Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra