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

[Electronic M]

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

I'm by no means an expert, but I seem to recall reading probably on the ETF website or in a 50's publication that the experimental TV guided bombs of WWII were the first use of intercarrier sound...I'm fairly attached to the notion that it was a WWII military development.

[teevee]

Originally Posted by Electronic M

I'm by no means an expert, but I seem to recall reading probably on the ETF website or in a 50's publication that the experimental TV guided bombs of WWII were the first use of intercarrier sound...I'm fairly attached to the notion that it was a WWII military development.

Can't think of any reason a camera guided bomb would need audio...
(lots of wind noise and then a very brief boom.) just my 2¢

[old_coot88]

..To carry audio tones for reed relays maybe? Just a SWAG.

[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.

[vts1134]

Going back to the original topic. I've posted photos of the contest as it was advertised before the giveaway. I've always thought the model Philco they were giving away was one of the absolute best looking deco television ever made. I would love to find one in the wild! I would hunt down the surviving family members if I weren't so damn tired and sleep deprived .