Need Preamp Recommendation

I’m having a 300b built , I’ve had several tube amps but this will be my first tube rectified amp.  
Those Quicksilver amps are sooo good , I was listening to them the other night questioning why I’m replacing them. Not replacing them exactly....  I will never sell them. 

what is your preference sonically to mate with (class A) SS?

Who cares?  The only thing that matters are your preferences.  What sound characteristics are you looking for?

I use Audible Illusions M3B with Plinius SA102.
M3B sounds much better than Plinius M16P and Prima Luna Dialogue premium.
The only catch is, M3B does not have a remote and its tube life is shorter than average, and their service is not prompt. Its used price is around 2K.
One of the best sounding tube preamps at its price.

as @soix says, it is YOUR preference that matters, as always... but we make allowance for the possibility that folks asking for others’ preferences is to help establish their own

here are some very nice combos:

-- c-j et5 into belles sa30 or pass xxx
-- c-j prem 16 into audiosector patek se
-- arc ref 3 or 5 into hegel h20/30 (balanced)
-- modwright swl 9.0 into arc 100.2

latter amps are not class a only but they are just as sweet, and more powerful than most