It's only MX4200 that has RF tube, MX8000 has: Pin code, STB controller, 1780 p teletext, 4/3 and 16/9 support, camcorder input, active speaker, HDR2 support, OSD and auto tune and naming.
optional: Master link, anti reflex, 5,1 DD and DTS, modulator (if Master), DVB-S, on some old sets: STB controller.