I bought most of my kit in the late 70s,still using it and my hearing has fine tuned to the sounds of the Quad 33 and 405 combo, Ram 700 speakers and Rega deck.New additions in the 80s included Arcam Alpha 7 Tuner, Nakamichi cassette deck,still going strong, plus a Rega CD player in the late 90s to bring me into the digital age.
I cant ever see myself changing anything.
Chapeau, monsieur, for sticking with great kit that produces the result that you enjoy. and not chasing shadows 'upgrading' .
You mention your hearing 'fine tuning'. This is an issue not many hi-fi 'enthusiasts' take into account.
Apart from the 'law of diminishing returns' in terms of the cost of kit -
1] objectively, is a £5000 amp 10 x better than a £500 amp?
2] In your norml listening environment, could you tell the difference?
3] Nobody's hearing improves with age. Quite the reverse.
I have lost a lot of top end in my left ear from inadequate ear protection on the firing range 5 days a week in summer terms. The high frequency crack from a Lee-Enfild Mk IV has produced tinnitus, exacerbated by the default entry into pro photography - shooting live gigs.
Despite the fact that I know the kit I have could be 'upgraded', the return, in terms of improved output leading to increased pleasure at the results, would be 'retail therapy' rather than reaslistic spending.
But don't tell the hi-fi mags that!