I agree with everything bpoletti references above. If it is a "tubey" sound that you are looking for you can’t really take the amp out of the picture. With that in mind a musical signal driven by a KT88 valve can give most preamps the tubey sound your seek. An original old stock Dynaco PAS pre/MK III amp will satisfy your quest for a dark, muddy, milky, thick, gooey......etc, etc musical signal. Needless to say tube amplification has come a long way in the last 50 years. Just one reason these have all been updated and modded. By avoiding neutrality you are adding (and some like it!) euphonics.
