The Allure of Vintage Audio Gear

Most of my gear is "vintage" -- the newest additions include a set of KLH 5's (which I love) and a 2018 Dennis Had Inspire "Fire Bottle" 45 amp and matching LP3.1 preamp.  My main setup is a MC-225 built in 1963 with an ARC SP17 preamp pushing Klipsch Forte II's.  I have my original Nakamichi Stasis system from 1987 hooked up to Polk Audio Monitor 10 speakers, and a Kenwood KA-9100 from 1977 with Electrovoice speakers.

Various other systems utilizing Dynaco, Reisong, Scott, etc., so I see no need to spend thousands on "new" gear now that I'm in my 60's.  The exception is upgrading turntables, cartridges, or adding an extra streamer.  More power to those dropping $90,000 on a new ARC amp -- but I'll spend that on my fishing trips, boat, and 150 year old cabin overlooking the river at my 100 acre farm.  Join me!

Had the bug / taste for high end now vintage Infinity and Yamaha back in a day. Moving forward still like the look / build so after several years Hunting for excellent examples I’m finally there. The heart of my system is IRS Beta driven by 2 Yamaha Pc5002m’s. Still sounds…. Expensive. 
Cheers 

I think you have two kinds of allure for vintage gear, gear that's a kind audio Stradivarius and gear that just looks cool, even if it doesn't perform that well. Not that there couldn't be gear that's both.

Vintage gear that still sounds good. 

Quad ESL57

Early Linn Sondek LP12

Naim NAP 250

Leak Stereo 20

BBC LS35a

I could go on.

How does the Sansui au-517 au- 717 and so forth integrates sound once restored properly? And I mean full service with perhaps some better parts if available?  Is this a worthwhile rabbit hole to fall into and to use this gear in a second or third system?