My oldest, originally bought new, piece is a Crown DC300A amp purchased in 1974. I was a soundman back then and used it as a PA amp for 2 years. It saw continuos duty driving Magnaplanar Tympany I-Ds up until about 1990 when I got a used Hafler DH220 which had a more refined sound. The Crown resides , in storage, underneath a friends house on the Big Island(Hawaii). I have fantacies of it driving some bass shakers, which is probably the only thing its good for anymore. I still own the Hafler, although thats in storage as well. I have a pair of Optimus LX-4s (Lineaum tweeter, kevlar woofer), modded per Dick Olsher, from 1994. I picked up an Advent 300 reciever dating from 1978 a few years ago thats a sweet piece, but that probably doesn't count as I'm not the original owner.
Old audio gear is like a familiar song. It brings back memories of a place, time, and feeling, buried in the brainbox, occassionally dredged up for a few wistful smiles.