In fact I have a PM 500 DC ... (plus a 250 PM) what a difference with the 510? Mystery.
The mine has seen capas condos and liaison replaced by Blackgate ... I do not know better musically apart AudioNotes that make the music any nobility, refinement in the Supreme ... and perhaps the most powerful McIntosh.
Heat patches, presence, natural notes with extinction like the real thing, not because the signal to noise ratio is exceptional ... Marantz listened but because its products ... with music! These are not the sounds that are important but the harmonics! A rating is not a simple sound (that's why we had left by the poor readers bleuffer cd that transcribe the sounds well, but not the harmonics!)
Today, we have ampilifilicaliteulireulis that make sound. Sometimes even good! With good bass! medioums good! Naigus good (nothing to do with the King ...) but not a lot of music.
Try the Vintage, beautiful, reliable, musical, super accessible, you will not change.