I bought a 105 new and played it that way for years. It is well know that the 105s biggest issue is/was the power supply. One day while surfing ebay I came across upgrades to the power side. First I did the Furutech- silver wire and a jumper to bypass the 110/220 switch. I was shocked at the level of improvement, so then replaced the OEM power supply with something like this, the product page included excellent DIY photo/instructionss. The combination was about $500 and well worth it to me.
Note that I use the XLRs for SACD, and for redbook I have it connected via 1.5m Pangea Premier SE digital coax cable to my Audio Alchemy DDP-1 + PS 5 power supply. IMHO, I would have to spend 2-3Xs more to better it
https://www.ebay.com/itm/123213854445?hash=item1cb01e36ed:g:tVUAAOSw7aBVFwZv
https://www.ebay.com/itm/383918790756?hash=item596357d864:g:upEAAOSwa3BgDr~X
hth
Note that I use the XLRs for SACD, and for redbook I have it connected via 1.5m Pangea Premier SE digital coax cable to my Audio Alchemy DDP-1 + PS 5 power supply. IMHO, I would have to spend 2-3Xs more to better it
https://www.ebay.com/itm/123213854445?hash=item1cb01e36ed:g:tVUAAOSw7aBVFwZv
https://www.ebay.com/itm/383918790756?hash=item596357d864:g:upEAAOSwa3BgDr~X
hth