SUT's that are a match to a Cart' are not all equal in their ability to impact on the end Sonic.
On previous occasion within this forum, I have made it known different Brands / Models / Transformer Types used for DIY Builds are able to create the perception of a Rich Tone.
The scale of Rich Tone can be perceived from a Hint of Rich, through to a very loose overbearing Lower Frequency Bloom.
From experience of use I am Wed to SUT's that I perceive as being almost lean, a Very small hint of Rich end of the scale.
A Head Amp is able to be perceived as being Lean and I do like these in use as an alternative presentation.
As Rich Tone can easily become a detractor and unwanted, have you an idea of how much of a Rich Tone you would like to be exposed to during your listening periods ?