Six 1940 Philco tv's giveaway

[dieseljeep]

Originally Posted by tubesrule

Tom,
You got me curious about the development of intercarrier sound. I haven't been able to find a definitive source of the early history of it's developments, but did come across this well researched thread:
http://www.forum.radios-tv.co.uk/vie...php?f=5&t=3824

From this source it would appear to be a post-war development. I also found several patents dating from 1950. Does anyone else have a source for the history of intercarrier sound?

Darryl

Motorola designed the intercarrier sound circuit, as their first 10" TV didn't have it. They designed it as a cost savings approach for their 7" line.
Every other manufacturer seemed to adopt it, except RCA and a few others.
It did state, on the licensing label, on the later RCA sets, that it did use inventions of Motorola Inc and several other concerns.