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?
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.
Atmasphere nailed one good reason (duh). There are quite a few others, from using tubes to rectify, regulate, as differential amplifiers....none of which greatly complicate the signal path. Plus several gain stages, each very linear, are sometimes better than one gain, over stressed stage. And a million more answers that really benefit from a fairly extensive understanding of electrical engineering....
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