If you are curious as to what you are hearing analog summing - tubes verses transistors this is a quintessential paper.
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I should also add that it tangentially covers if there is iron in the path (transformers) or not as Iron has non literalities and will also generate second-order harmonics.
Fun read, and makes a lot of sense.
It reinforces that the basic technology is largely indistinguishable but that there are auxiliary influences that are meaningful. Without separating them and understanding actual root causes, old wife tales develop.
One paradigm that was drilled into me in part of my career is that you need to ask ‘why’ five times before you get actionable answers. The first and second ‘why’ invariably just covers observations or symptoms but not root causes or actionable facts.
It is very true I have done testing both on the bench and listening.
It is also why I have analog eq in the monitor chain - gives me a richer sound - there is a thing as too clean…s