Preamp suggestion for Quicksilver M120 amps

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.

Why don’t you just stay with the P5 preamp? Or is that a loaner.

By the way my brother is having the same issue re lack of weight with his QS mid monos. So he is following your journey closely here.

The G

I can keep P5 pre.
Really wanted to have a good tube pre to match the M120s.
Hoped for a synergy within QS brand.

FYI: There are two models of that QS. The older one uses 12AX7 tubes and the newer one uses 12AT7 tubes. Are you sure that the one you have is the newer one? BTW, the new model has no mono switch!