"Michael A. Terrell" wrote in message
...

"Geoffrey S. Mendelson" wrote:

I don't know how well UK sets worked in the 1960's, but US TV sets were
not capable of receiving adjcent channels at one time, so they were not
used. For example, channel 2 was used in New York City, while the nearest
channel 3 station was in Philadelphia, 90 miles away and too far to be
received without a large antenna.

Those '60s TVs worked fine on CATV, with no open channels.

CATV in those days often involved "Cable Converter Boxes" which used the TV
as an IF strip.

Even sets from the '50s work well that way.

IME, the early 50s TVs were better made than their sequels in the late 50s
and 60s. The picture tubes and sweep circuits got larger but the RF, IF and
video circuits were "simplified".

Early CATV was simply 12 VHF channels
deilivered to the TV at 0 dBm to +5 dBm.

Some super cheap sets with a
single IF stage and no RF stage didn't work well, but they were the
floor sweepings of the industry and intended for markets where there was
only one or two stations.

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.