Alan, you are a moron. I hate "audio-philes"
such as yourself posting non-sense about things
you know nothing about so you can feel somehow
sophisticated. Besides their many drawbacks,
tubes are non-linear devices which means they
distort the original sound recording. If you
like this, fine, just don't pretend it's "more
realistic", because the opposite is the truth.
Why don't you just buy yourself an equalizer
and crush all the frequencies you don't like.
I hope you don't bullshit your customers this
badly, moron.