At 06:19 PM 12/18/2008, Al Kossow wrote:
The earliest
I have seen so far is a
Sherwood FM tuner ca. 1977 that uses an RCA 1802 (e.g.
http://atlanta.craigslist.org/ele/927622156.html).
Bit of trivia. That tuner was designed and built in Milwaukee by a
company that a friend of mine worked for. At the time, several of
his friends built units up from leftovers from the production run.
Draco was in Milwaukee? Interesting!
It's probably in United States Patent 4122395.
http://www.patentgenius.com/patent/4277785.html
Patent says Grafton (northern suburb). PDF manual, including block diagram:
http://www.fmtunerinfo.com/Sherwood.pdf
- John