I agree with post #1 and post #2.
To add a little more--these "tube sonic qualities" that you mention--basically what you are saying (whether you realize it or not) is that you want to use a tube amp as an fixed-curve equalizer, or as a signal processor. That is NOT the job of the amplifier!
The job of the amplifier is to receive an input signal, and produce an accurate copy of the input signal, but with larger magnitude at the output stage.
If you want to alter that signal, the tool for that job is an equalizer or a processor.