Is the OP looking for advice on where to find ’Quality used gear’?
As it is to be ’used gear’, Which is the preferred era range of the production?
Obviously Quality and used can have a very broad range in purchase prices, does the OP have a budget constraint?
From the OP as their follow up posts, only conjecture seems to be forthcoming. I take such statements with a ’pinch of salt’.
Is one really going to part with $25K for any item used in a HiFi system, using the fantasy, the purchase is on par with a $50K used/new item.
I hope not.