My Dad has one connected digitally via USB to his Mac 8950 and it sounds great with the Mac DAC 2 card doing all the heavy lifting. Yours is all analog so I am surprised to hear you say it sounds better with no preamp.
Maybe time for new tubes?
Eversolo DMP A6 with or without preamp
I just bought an Eversolo DMP A6, and it sounded great by connecting directly to my MacIntosh MC302 amp. I am trying to figure out why it seems to sound better than going thru my Mac C2300 tube preamp which shouldn’t be too shabby.
Are most of you using this DAC/Streamer by directly connecting to the amp? Any recommendations would be greatly appreciated.