best transparent pre amp

You are asking the right question
"Neither add or detract from the signal provided"
This is called being "true to the source"

But need more info, what is the rest of your system
EG:
Source name and model?
Poweramp name and model?
Speakers name and model?

Cheers George

Mccormack Dna-1 silver upgrade
Alon I I speakers

Amr cd 77.1 soon

I have heard a few good ones. The Soulution 720 stands out as one of the finest I have heard but was comparing different systems.