American Radio History site:
THE HISTORY OF RADIO documented in thousands of PDF books and magazines
Lots of PDF's of old mags including Audiocraft-
AUDIOCRAFT: Do it yourself Hi FI publication from 1955
And Audio Engineering-
AUDIO - Consumer audio and music magazine from 1947 to 2000.
And DB magazine-
db MAGAZINE -1967 to 1994 Audio Engineering journal
If nothing else you can drool over the old stuff in the ads!
