Thank you for your answer. It is food for thought.
l have noticed the same with recording records to Reel to Reel, and cassettes. The sound changes. Some characteristics altered by tape manufacturers bias. Playing back through the same amplifier and speakers there are marked differences more often than not.
With direct interference altering the playback speed equalisation on my Akai l can take the shrill off an edgy bright recording, or brighten up a dull one. Not a pure playback, but a useful feature that can’t (l believe) be done within a digital system.

