Do you own gear from defunct brands?

Altec mdl 14

Audioprism amplifiers

Klyne SK 5A

All still making music

Herron stack. First gen phono pre, last gen 360 preamp, and M1 monoblocks. 

Hardly defunct, but no more new production, so yeah. 

@mswale 

"Think once something is out of warranty, does it even matter? You can't really get service manuals anymore, most things are now surface mount and IC based. Almost no one can fix them anymore."

I don't think so. Much of the better hifi gear is still made with discrete components simply because there is still a contingent of designers and audiophiles that think they sound better. Also, more often than not discrete and surface mount are used in combination where engineers deem appropriate.

Vacuum tube hifi components which are extremely popular among a niche segment of the hobby are principally designed around discrete components and any tech worth his salt can troubleshoot them quite easily, repair them and restore them to original spec without any service documentation. Albeit there will be chassis components like transformers and such that are single sourced, likely a qualified tech can affect a repair on any other part of the circuit.

Luxman, McIntosh, Klipsch and other long-standing brands can provide or arrange to have any product they've ever made serviced and brought up to spec. You get what you pay for! 

I worked for Teledyne in the late ‘80’s when they owned Acoustic Research, and the employee discount was significant. However, I was young and couldn’t afford to take advantage of that, and soon after Teledyne sold A/R. I regret not owning a pair. On a positive note, I have a Kenwood CD player from 1987, original to me, that’s connected to my McIntosh MA 8900, and performs flawlessly. 

Acoustat TNT200's and Spectra 33's,  all rebuilt and upgraded.