Judging equipment

I have a question for experienced members.
I have a 7000k cdn 2 box pre amp from YBA it Is 1 step below their top of the line signature series which is another 25k I have had for this pre amp for 2 years now. I recently bought a tube pre amp from a boutique hand made mfg here in Ontario for 1200 cdn

Maybe my hearing isn't what it should be but when I swap out the pre amps and play my test tracks over and over I do hear a slight difference in sound between the 2 but given the difference in price I would expect much more of a difference.

As I said maybe it is just me.