My 6 year old 65" Mitz RP HDTV has no HD/digital tuner. HD looks great from my 722 via component (red, blue, green inputs for video). Like Gary said, as long as he has component inputs he'll be fine. I think its possible he might have a DVI input as well. If so, just pick up a DVI to HDMI cable. You'll have to use a composite (red/white) for audio in either case.
Ed