Six 1940 Philco tv's giveaway

[tubesrule]

Originally Posted by Electronic M

I disagree with your point. One example I can give is intercarrier audio IF. It was a WWII invention that reduced the tube count greatly, and stabilized relative fine tuning of sound and picture...So they would drift together and in the same direction as the set warmed up.

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