One of the more reliable SS reviewers was David Rich, who also did gear teardowns for Aczel's Audio Critic. Today? Occasionally Rich shows up with (of all things!) record player and cartridge measurements, over at the Secrets of Home Audio Webzine.
Gordon Holt more or less started it all, and you have to give him credit in the keep on keeping on department. Those were pretty lean years. Publishing a magazine with any frequency was more than most could pull off--and without advertising. Stereophile in its early iteration was really an annual, maybe twice a year if you were lucky. At least until he sold the farm. Then things improved (as far as mailings went).
Same with Aczel. Promised six issue a year... that lasted about four years, nine full issues (plus a few 'newsletters'). Later, with his resurrection, his publishing schedule was pretty consistent.
Pearson did a pretty good job in the 'get it out the door with reasonable consistency' department. But once you started flipping pages, it was mostly interminable blather. And, of course, Harry's charming personality in print. Enid Lumley was worth reading because she was so neurotically funny, although at the time she certainly didn't realize it, or mean it that way.
There was a bunch, actually. StereOpus, Hi Fi Heretic, Sound Advice, Audiogram, International Audio Review...
Probably the longest lived publication is that of the Boston Audio Society--the Speaker still soldiers on in its own way.