Do you own gear from defunct brands?

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

Apt Holman preamp. Hasn't needed a recap or a rebuild (all checked thoroughly by a pro repair artist). Best piece of gear I own!

Still using my Phase Linear gear, all Series II.

Two WOPL 700's

1100 II Equalizer

1200 II Analyzer

4000 II Preamp

5000 II Tuner

1000 II noise reduction... for LP play

Love the looks of vintage gear.

Yes. 
LSR&D mono SuperAmps refurbd and working

Original Genesis IM8300 3 way speakers

Some of my system is new, Sonus Faber Olympica Nova speakers, VPI Prime Signature turntable with VPI Shyla cartridge. I just replaced a twenty-year-old ARC PH-7 with a 15-year-old Pass Labs XP-25. Here's the kicker. I inherited a Hovland Radia Amp from an audiophile friend who passed away. Hovland has been out of business for over twenty years I think. The amp was raved about when it was new. It is a better amp than anything I could afford to replace it with. If anything like it exists. According to Bob Hovland, the designer and manufacturer, this amp was twenty years in the making. He'd only made tube amps prior to this one, and he wanted an amp with solid state punch and tube warmth. There isn't anything it doesn't do well, and I was lucky enough to have Bob Hovland check it over to make sure it was up to specs. There is so much about it I like, I don't plan on replacing it.