I am not even sure what the purpose of such a device is
Personally, I wouldn't buy tube at all. Unless I am just really rich and I can buy, buy, buy, then I'll buy a tube just for fun, to try and to experience this tube thing and probably be bored after few weeks.
But there are people out there who are drawn in by it. Even those who knows it's old tech and inferior but are still drawn to it and willing to spend money on it, that is their prerogative, albeit everyone else should be free to express their opinion on how stupid they think it is.
But here is the problem, there are those who from the bottom of their heart believes that tubes sound better than solid state because there is some tube magic. That set of people, are a lost cause. . .let them be, besides ignorance is bliss.