On another forum I came across a post from someone that listed a link to old issues of the Hi-Fi Stereo Review magazine. It goes back to 1958. I thought it was interesting to see the evolution of the industry over time. Reel-to-reel seemed quite popular through the 60s and into the 70s, which then changed to cassette sometime in the 70s, followed by compact disc. Some of the reel-to-reel brands I had never heard of.
There are interviews of stars, such as Cat Stevens and Linda Ronstadt, among others. I saw a review of the PS Audio 4.5 or 4.6 preamp (they liked it very much).
I thought it was all pretty interesting, though time consuming.
Here is the link: https://www.americanradiohistory.com/HiFI-Stereo-Review.htm
They also had issues of Audio magazine, which go back to 1974.
Here is the link: https://www.americanradiohistory.com/Audio-Magazine.htm