I have a pair of DSP3100s of unknown vintage, I had the 'backs' off the other day in an effort to diagnose a comms problem. Whilst they were apart there I noticed the 4 power supply smoothing caps had bulging tops, so have replaced them, not a difficult job to do, but something to bear in mind with older electronics.

Nick

Sources: Auralic Aries G1 & Re-plinthed Thorens TD-150/ISOkinetik Power Supply/Linn Ittok/AT33PTG/Trichord Dino
Speakers: DSP3100
Other: QNAP TS-451+ as a Plex and Roon Server, Samsung 4k TV-Plex Client