Anyone recommend a neutral tube amp?


I've been wanting to move to tubes for some time now. Lately I've changed most of my equipment. I now have a Rega Saturn CDP and some very revealing Opera Callas monitors. My amp is the Sim Moon 5.3 integrated. I like the neutral character of the amp, it simply takes on the characteristics of whatever is being played through it. Can anyone name a tube amp that is similarly neutral, that won't color the sound of the CDP?
rfprice
there is no neutral amplifier. a well-trained listener can detect coloration after auditioning an amplifier for some period of time, with a variety of recordings.

my experience with my mac 275 indicates that the amp has e very minimal coloration.
Cayin A88t integrated, or other similar models, cheap enough to keep for a doorstop if you don't like it.

Very, very, very good sounding for the money, and flexible.
Remote volume and triode/pentode switching...

Good solid sound, and makes audio fun again.
I'm surprised no one mentioned Audio Research. Their claim to fame is 'neutrality'. And though some think them lean or dry, not compared to ss IMO. I have a Mac 275, like Tennis, driven by a ss Levinson 26s pre, and find that combo close to ideal for me. Although I'm sure any top ss pre would work fine; like Klyne, Krell, Ayre, Boulder, Goldmund, etc.
ARC would seem be leaders in the neutrality arena. I think my CAT JL2 would fall into the neutrality side of the ledger.