FrostEOne
Active Member
FWIW, one may get a feel for the state of the ca. 1970 hifi art by perusal of:
https://www.americanradiohistory.com/Audio-Magazine.htm
https://www.americanradiohistory.com/High-Fidelity-Magazine.htm
https://www.americanradiohistory.com/HiFI-Stereo-Review.htm
http://www.alliedcatalogs.com/html/1970-290/
https://www.americanradiohistory.com/Electronics_Catalogs.htm (1969 and 1971 Heathkit catalog PDFs available, nothing from 1970 per se unfortunately)
http://www.radioshackcatalogs.com/html/1970/
https://www.americanradiohistory.com/Archive-Other-Documments/DC-FM-Forecast/FM-Forecast-1970-08.pdf (check the advertisements)
Wow, great links! Thanks