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RE: Tube rolling preamp or power amp gain tubes, which ones (or both)?

Ahh, I did not know that, that the power tubes make the biggest difference.

And so just to confirm -- and we are talking about only the power tubes for the amp -- those get selected first (based on a desired sonic outcome). Then afterwards, one begins a process of "fine-tuning" with gain tubes.

Okay, so assume I have selected the power tubes (or that I like the sound of the stock power tubes and have decided to retain and use those), I still have a choice at that point to swap out gain tubes on either the pre-amp, power amp, or both. What is the selection process now? Does the greatest sonic change occur with changes to the preamp gain tubes? Or to the power amp gain tubes? Does it not make a difference which gets changed because the sonic difference either way is not appreciably significant? And further, once a decision is made as to on which device gain tubes should be changed (assuming there is an obvious choice), would swapping out tubes on the other device produce even more of a sonic change (so much more that most people would judge that change to be worth the investment in the additional tubes)?

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