longest of current gear;
Studer A-820 RTR Master Recorder--10 years.
King-Cello tape repro output electronics--9 years
gear where i have simply upgraded to the newer version;
darTZeel NHB-18NS preamp-12 years (2005-2016-1st version, 2016-2017-2nd version)
gear i stepped up one model in the same brand line up;
darTZeel amps-13 years (108 stereo 04’-12’-----> 458 monos--12’-17’)
Evolution Acoustics Speakers-12 years (MM3 05’-12’-----> MM7 12’-17’)
so really for over a decade my system has had the same sonic viewpoint.