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
Tube amp, even it is OTL, has much higher output impedance which when interacts with speaker can cause multiple db swing in the speaker's frequency response. If you really want a neutral amp, don't buy tube.
The Coincident Technology Frankenstein II is the finest most neutral tubed amp available at any price. It may be purchased directly from Coincident Technology. The asking price is a bargain. I have had mine for over 1 year and I have never "looked back."