Arcane inquiry re 1960s speakers ad

Im not sure if this is the appropriate forum for my inquiry, but I wonder if anyone in the audiophile fraternity can answer a trivia question about a print ad I saw in more than one issue of High Fidelity (and perhaps Stereo Review also) in the late 1960s. It was a full-page advertisement for speakers -- the company I cannot recall, but it was among the leading names in stereo components during that period -- featuring a stylized color drawing of ten famous classical composers standing together in a group. Beethoven was in front, holding an ear trumpet, with a cartoon balloon above his head saying "WAS?" (German "What?). The other figures were arrayed beside and behind him and were instantly recognizable to music lovers -- as I recall, they were Bach, Handel, Mozart, Haydn, Schubert, Schumann, Wagner, Brahms, and Tchaikovsky.
The caption underneath said something along the lines of "9 out of 10 listeners tested" endorsed (or some similar term of approbation) the excellent sound quality of the product. Beethoven was obviously unable to do so, and was hence the outlier. Does this description ring a bell (sorry, Ludwig) with anyone? If not, can you refer me to any possible online source of such perversely arcane data? I would like to know which company's ad this was, and ideally which issues of High Fidelity (or other periodicals) might contain it. I will not be deaf to any information which may be offered.
It was an ad for Pickering cartridges. See page 4 here.

You can find other issues of High Fidelity from that era at the same site, linked to on this page.

-- Al
Al's the best!
Great stuff Al. I forgot how many people bought tape recorders back then.
I miss that rag. Wonder what form it would take today? I'd like to buy a truckload of Dynaco Stereo 70's, at the price advertised, in that issue.
WOW!! What a remarkably prompt and authoritative response! I knew I could count on the collective brain of audiophile devotees. And my memory displays its fallibility once again -- it was an ad for a phono cartridge, not speakers, and I missed on one composer -- Haydn isnt there, but Liszt is. Well, not bad overall, I suppose. THANK YOU, AL! You are clearly a grandmaster of audio trivia. And thanks also for the link to the vintage High Fidelity archives -- that will make for a true browsers delight. Much appreciated!
Thanks for the memories Al.