Many of the most expensive tube amps/preamp have multiple tubes...6, 8, 10. If direct path is preferred in the speaker by most, why the acceptance of a glass army in one's amp/preamp?
Not sure what is meant by 'direct path'... But if you need a lot of power, you might need a lot of tubes to make that power. If so, they'll be in parallel, which means the signal is fed to all of them and they all work in tandem to make that power. In that particular case, the signal path complexity is the same whether one power tube is used or 20.
But… the signal is added up coherently, whereas the noise is adds non coherently. So in theory it is better to have the elements in parallel.
I live in a cold climate and need the heat that the KT150's provide. 4 per amp and my sound room is comfy from October to May. During summer... well, that's another story.
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