The 400 Evo I would-not recommend ,you loose a lot of resolution in the volume pot if it’s a round silver $20 alps type , several several tech friends build preamps from scratch ,that is the 1st thing they discourage what good is have a well built machine and then at its volume attenuator you have junk ?
I soldAudio for years you want either a relay type ,or resistive ladder type , a separate transformer type are excellent also but-very expensive.
These types take up. More space and much more expensive to build, these alps type are just plastic wipers with a conductive coating ,you loose a lot of low level detail with these cheaper type .that's fine for a $1 k or less preamp , also your power supplies are very important to keep the performance from drifting especially when the volume is turned up,or things get complex.