Yes they won’t repair domestic products and that’s why I ask how old is too old. Fortunately, I have an engineer friend who can fix as long as he could find a schematic, just in case.
I prefer class AB to A just because of the heat, And I want little extra power since my family room is open floor all the way to the eating area and kitchen.
As for speaker and others, I am thinking of Tannoy Sterling, Harbeth M30.2, Magnepan LRS, Spendor A7 or S3/5SE, Ohm Walsh 2000, Proac response D2S, in orders. Optional REL subwoofers as needed.
Source will be Tidal and home network streaming to Topping, Denafrips, or Gustard DAC.
I agree. 15 year is the max lifespan without performance degradation