The longest you have owned any gear?

the longest equipment i've had is my 4 bose 901 series 2 speakers which i bought back in 1971. i'm not reaaly an audiofile. i bought my 4 chanell system back in those days when i was like 18 years old.

g_nakamoto: I could not afford the Bose 901's (as I recall) but in 1973 I did buy a Sansui QRX-6500 4-Channel receiver.  I remember that I bought it in the Navy Exchange overseas (at a nice discount) for exactly $512.00.  In 2018 dollars that is right around $3000.00.  My young wife was stunned!  To go with it, I bought four huge Sansui SP-3500 speakers.  Kept them for about 20 years and then sold them to my brother in law.

Phillips CD-80. Bought it from a local 20 years ago, sold it once and then bought it back from a local audiophile. Original box, papers ,transport screws,etc. May use it as a transport when I get more room.

1984/1985 I purchased my first hi-end system:
Threshold SA-2s, Fet Ten line and phono stages, Sota Star Sapphire with an SME V, Cambridge CD player, McIntosh MR80, and Snell A III speakers. The CD was replaced some ten years ago with an Ayre which I still have in my current system.
The system sounded great up until October 2015 when I decided I wanted a change and went to tubes. My old gear is stored in the basement for my son who doesn't have the room at his current location.

My aiwa ad f770 cassette deck, since 1983 to present. It still works as good as day one, with a new set of  belts. Second I guess would be 2 of the many tuners I own. The marantz st6000 and the cambridge t500.