Came across these circuit books while looking for a 0.1% 300V regulator and thought they will be useful for that and the many other circuits contained.
The circuits are standardized to work as built and preferred by the Navy Bureau of Aeronautics and the Department of Commerce National Bureau of Standards.
The government wants you to enjoy them too!http://www.navy-radio.com/manuals.htm - search in page for the "text in quotes"
"Preferred Circuits Handbook for Electron Tube Circuits"
and also
"Preferred Circuits Handbook for Semiconductor Circuits"
Also search for "Military Standard Electron Tubes" in that same page.
(this book also supercedes Armed Services Preferred List of Electron Tubes)
It's a list of the tubes approved for use in gear built for Uncle Sam.
navy-radio also has a link right there to the 1974 final version which is at another great free site for public domain government and military manuals, everyspec.com
http://everyspec.com/MIL-STD/MIL-STD-0100-0299/MIL-STD-200K_22310/
