Regular Scheduled HD Television is 75 Years Old

[wa2ise]

Originally Posted by Penthode

In 1937, RCA and other experimental broadcasters moved up to 441-lines, AM sound. This was the RMA (Radio Manufacturer’s Association) standard at the time.

I can imagine how AM sound would have sounded with the intercarrier system developed later on.

You could do a reasonable simulation of 441i using a DTV converter box set to letterbox mode, and a TV set, and assuming that there's enough oomph in the vertical jack up the height to make the black bars at top and bottom disappear to vertically fill the screen with picture, and increase the horizontal width to make the picture look reasonably correct. Or mask off the CRT to shrink the screen size. You could (assuming you have the woodworking skills for furnature quality work) build a prewar style console cabinet (or convert a common radio console cabinet that's missing its radio chassis, herisey!), and insert a decent B&W solid state TV or video monitor set inside, masked off to have it show approz 441i lines. And build a tube audio amp to drive a large speaker mounted below.