Preamp suggestion for Quicksilver M120 amps

Got the Line stage. Spent 20 min listening. Compared to solid state Simaudio Moon P5 , it feels like I lost the grip of M120s. Solid bass, full midrange are gone. Need to do more listening.  

OK, now I am confused more then ever. Have 3 preamps on hand: QS LS, passive Prometheus TVC and Simaudio P5 (dual chassis). QS was the least favorite of the 3: no weight, very lean, dry sound. The TVC gave me some weight, transparency. Simaudio was the best, it owned the M120s, full rich sound, very spacious.
Now what? I was hoping QS would be the ticket. Stock tubes, I do not think the amp was ever opened. Do I take a chance with NOS? 

Anybody had good results wuth QS power using a SS pre?

Gents, please weight in!

agranttz OP

Use a phono stage with high gain >60db and feed that into your Prometheus TVC you should be right to go with that, even though I find transformer passive volume controls quite colored and softened.
I think the Sutherland PHD can do set at it’s highest 61db.

Cheers George

Since you bought the unit 2nd hand, did you check to see if someone possibly changed the tubes and coupling caps, what’s installed now?

How about Audioconnection’s inverted polarity note above, did you try it, and did that help?

The QS was not tampered with, the original tubes and caps. I did invert the polarity.