The way the question is worded, it's pretty apparent the OP already has his mind made up, IMHO.
Actually, no. I may have posted a few times my dream of owning a lefty 1966 Sunburst and tortie Jazz bass with the block inlays and lollipop tuners. I also lust (albeit with less fervour) after a modern MiA P or J. Or if someone would give me a choice between a modern fireglo 4003 or a vintage 4001 I would probably die of indecision.
So, it might be apparent to you, but it's not to me, the OP -- and I suspect, a few other posters on here. Maybe Nobody finds it apparent.
Clearly, at least some people in this thread understood my OP. I used tuners as an obvious example, because on the Fenders at least, they've switched manufacturers a few times. We can talk about bridges. We can talk about nut material, paints, lacquer, durability, etc...
I genuinely want to know how the old Klusons stack up against the Gotohs or Hipshots that people use now, if there is a significant difference. Muddslide's post is the kind that interests me. There have been others as well.
I worded the preamble in that way because I'm not interested in the mojo/vintage vibe aspects of a bass -- I think it clouds an instrument's inherent value. I have little experience owning or even playing what's considered a vintage instrument, but I love how some of them look, especially those that have been well taken care of, their decals, etc... I also want to know if there are others out there like me who really don't care about the vintage label, just that the age is incidental.
But since you mentioned you have a '66 Fender bass, they probably came with in-house machine heads. You say they hold tune... how do they compare to any other tuners on your basses?
I don't know if my vintage basses are better quality, but I prefer the ones I own ('66 Tele Bass, '75 P Bass) to most of the modern ones I've played. To me they look, sound and feel better, to my eyes, ears and hands. It doesn't mean that someone who prefers modern basses is wrong, it just means they have different criteria.
It's not about 'right' or 'wrong'. See, this except is filled with the exact kind of information and experience I was hoping we'd discuss. Thank you.