The comments are proof, as if proof were needed, that the list needs to be longer than 17! My personal addition would be Mission 70 Mk2s. After over 35 years I’m still impressed by them over contemporary speakers. Now that’s longevity.
well i have to say that i have working without any repair,
some Philips from 1968 and they sound amazing good ,
some Pioneer cs from 1970,
Celestion Ditton series from 1970,
some Kenwood from 1971 ,
than i have others from 71 till 79,
some Sony SS-G9 82 ESprit ,
some Mission 761, 4ohms when they released the Mission cyrus 1 integrated amplifier maybe 86
the Mission Argonaut (780 model)
the Mission 707 from the same catalogue as the Argonaut and 761 maybe the year is not correct but close
this sounding good without any intervention ,
Sony are what amazed me the most as nothing i have from Sony work without a repair somewhere in time as the system i bought all from sony from the same catalog as the speakers i refer, all were repaired,
and also the only 70´s component it needed a repair all others work perfect just have been sending some to be restaured to original specifications but all worked perfect that i had noticed ,
either than Sony also Sanyo and Nakamichi all components needed repair none worked without a repair here and there and they say it´s the best , maybe because they never owned it and only tested them new which sounds amazing as others
once i read that Sony was close to Nakamichi ,yes both needs repair not a lot of years after the purchase