Is it worth replacing an old amp?


Let me first apologize if this question has been asked before, I sure it has. I have an old 5.1 setup, Linn AV 5140 and 5120 speakers along with an old Yamaha DSP-A1 amp. The newest equipment I have is an OPPO 205. All my music is digital, where the vast majority being Hi-Res flac and dsf. The question I have is, would I get a noticeable increase in audio quality if I was to replace the old DSP-A1 with lets say a used Mcintosh MC205 or comparable?
divby0
I've been using an old Aragon 8008BB for the past 25 years in my secondary system with some KEF LS50s. I got the bug to upgrade, so I bought a PS Audio Stellar S300 Class D amp a few weeks ago at a great used price.  Bottom line ..the S300 does some things better than the Aragon, but overall, the Aragon is richer sounding & more musical. 
The latest Yamaha models are very musical with a European flavour rather than the historical Japanese sound. The HT models can do Stereo very well and for their cost and reliability (which you are aware about with your current amp) but the dedicated HiFi models sound fantastic for the price.
All IMHO 😷

AG 🇦🇺
I still have my original Yamaha HT amp from way back (and matching cassette player) and they still work and sound reasonable. I’ve acquired and passed on a fair number of HiFi and HT amplifiers, with a good number number of them Japanese flagship models. The beauty of these are they sound great (most of these would be in the top 80% sound wise) and second hand are great value.

My choice would be one of these.

Cheers AG 🇦🇺
I can just say that I changed from a cheap and old amp to a similar priced but new amp and the sound improved a bit. Then I changed to a much more expensive amp (also pretty new) and the sq improvement was huge, even with my old speakers. So it can make a big difference. I bought everything used and gambled but it payed off.