My humble personal opinion.Used to have lab3k,6k and cosmic k8 tape deck( with feather touch buttons).Also bevox 3ways spkrs.FS.Also Cox graphic EQ.Cosmic turntables with sme arm.Used to belt out deep purple and rolling stone LP's. The sound of today's systems IMO are way ahead.However the typical quasi complementary output topology I think....using 2n3xxx TO3 BJTs did a good job in those days .I did open a amp a few years ago out of curiosity.Dont have any with now .Only the TT but it's not with me as I don't do vinyls or tapeamazing....just look at that rear...can put any big-wig amp to shame...not sure how they sounded though, we never owned one!!
Yes the drool factor of the advt on the last page !!!!I'd love to own one too...never had one at home but I used to sit as a 10 year old kid and admire them on their full page adverts on the back cover of Elektor magazines back in the early 80s...cosmic does not exist any more.