The longest you have owned any gear?

Still going strong after 30+ years - my Audible Illusions, Modulus 2 pre amp. still in use and sounding great.

Inna, you did miss at least one open reel deck---my Revox A77, bought new in '72 and still in my possession.

Sorry. I can see that some people still buy Studers on ebay, for about $4k, but don't buy them for over $5k. I don't get it. When it comes to Studer and considering that $4k is already no pocket change, I would be prepared to pay extra $1k if I saw a good reason. 

I still have in use an Ariston RD11S TT that I bought new in 1977 ($280). No arm. First arm was a SME 3009, second was a JH Formula 4, third was a Keith Monks, fourth was a Lustre GST-1 and last (and present) is a Grace 707/ Denon 103 combination. The mat is also from 1977 - a Hiraoka Diskmat SE-22 that I bought new from Harvey Sound (48st NYC) - $20! Still sounds great! I also have more TT's, including a Linn Sondek, though none have been with me as long as the Ariston!

 I also still have and use the Audio Technica Record Weight that I bought new in 1978 ($15) from Audiocom in Old Greenwich, CT. A great store! They carried GAS, DCM, Snell ... and Beveridge!