Save if you invest in very highly advanced engineering H-Fi , vintage may be the best S.Q. /price ratio possible...
It was for my speakers and for my amplifier...
Cost ridiculously low...
S.Q. ridiculously high...
One of the better amplifier in the world in 1978 cannot be bad today... Only very good... Not the best there is now for sure, but who want the best anyway? Someone with a deep pocket....
And S.Q. anyway is more related to "acoustic and psycho-acoustic intelligence" than to ONLY engineering per se...