I know semantics makes these discussions difficult, but there is no way that an amplification device can slow down the tempo or speed of music. They may sound rhythmically lethargic, but not slower in speed.
I've done a lot of tube rolling. Favorites (in order) are: Telefunken 12ax7, Raytheon 7025, GE5751.
I've done a lot of tube rolling. Favorites (in order) are: Telefunken 12ax7, Raytheon 7025, GE5751.