I don't know of any TVs with only 1 IF stage for video.

*'Madman' Earl Muntz made some real crap.

Even his stripped-back products had 3 (6AU6) video IF stages. If memory
serves, they may have had only 1 IF stage for sound, but with intercarrier
sound, that's not a fair comparison.

By the late 60s a number of mainstream manufacturers were building sets that
were influenced by Muntz.

He loved 'Reflex circuits' where a single tube was used at multiple
frqurncies. *He was stingy as hell about bypass capacitors and
shielding, as well.

Madman Muntz put a TV in houses that otherwise would have had none
and they worked in strong signal areas pretty well. They were tough to
fix but they usually lasted long enough that by the time they took a
**** there were better cheaper sets widely available. He was not a con
man, but he was certainly a self-promoter. The term "Muntzing"
survives today in analog design circles.