going from tube preamp to solid state

I think alot has to do with the design and implementation of the preamp, whether tube or SS and how well our ears are trained to hear these deviations. I had a Rotel RC-970BX preamp and thought it was sounded good, and it did but when I went to a RC-995 and honestly, their was a difference especially in the bass region. To me, bass is important in general, anything from subbass to 250hz. Any fundamental sound produced in this area may have an effect in the higher octaves.

There's an enormous difference between various brands of tubes.  I have no experience with the 6SN7.  My preamp runs the 6CG7, which is the electrical equivalent.  But there are big differences between various manufacturers.

Try doing some tube rolling and find what sounds good to you.

I have a highly customized SMC Audio SS preamp that sounds fantastic.

I would suggest giving SMC audio a call because they’ll build something that can meet your personal needs, wants, and budget.

I've had my two Dynaco ST 70's and PAS 3 preamp and Magnepan and Vandersteen speakers for almost fifty years and loved them. I've been careful to to maintain and upgrade the Dynas  but they have lost their luster  for me. I suspect it's mostly due to my diminished  hearing ability.  I've just replaced them with a McCormack DNA-0.5 Deluxe, a Parasound 850 preamp and an SMSL DAC and I'm in heaven again. It may be due to these particular components and not their solid stateness but  the music is back;

@innersound300

I tried various combos of amps and pre amps over many decades. In the end I generally preferred a solid state amp and a tube preamp.

I have the same preference.

Consider posting the issue that you’re having with sound reproduction, such as soundstage and post a photo of your system and a listing of components in your profile. This will get you to a better solution without presupposing that the problem has to do with your preamp.