Thing is.. I'm pretty confident it's not the tubes.. it's everything else in the black box. Namely, that (cap?) in the front.. when that's reached a certain warmth, the magic happens. I've swapped tubes then and noticed every tube sounds its best almost immediately.
I experienced the same - SW51 was on but not playing music for hours, shut down, swapped tubes, turned back on, took a listen. Warm amp + cold tube was distinctly more "expansive" with regards to headstage. After a couple hours, it was kinda like, where'd all that expansiveness go <insert davechapelle crack junky.jpeg>?
No, rather, when the amp is warm, but turning it off and replacing with cold tubes and then back on, the sound is more expansive than with the warmed-up tubes that were replaced.
I understood. The cold tubes come to the desired mode for a while. At this time, their parameters are not the same as those of a hot tube. In order to hear this, you need a very sharp and trained ear.
You can only envy the ears @FlySweep
I can only see such small changes using measuring instruments.
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