long term components

Yamaha NS1000M speakers, 29 years; QUAD 44 pre-amp, 25 years

Rack-early 80's, although highly modified.

I also have a pair of AQ IC's from the same time but put Cardas ends on them.

The longest would've been a Sherwood receiver I bought in 1979 but the cat knocked it off a cabinet, so it lasted 19 yrs. Too bad, 'cause it still looked brand new till then.

Spica TC-50's & lead-shot filled stands - had the same pair that I bought new in NYC, for about 15 years. Thanks for the unwitting reminder Honest1.

The next runner up is far off the mark...

Quicksilver 300B SET amps
Modified Klipsch LaScalas

I enjoyed those for about 6 years.

Audio Research 100.2 has been a part of my sytem for over a decade. A great amp

I forgot to mention my own..a pair of the original advents for five years, then I doubled them for another three years