> I can tell a difference with vinyl and the amp

Here are a few possible differences:

- RIAA EQ curve on the vinyl compared to the mastering on digital music

- Vinyl is not exactly a precision format, it's very noisy and you're getting a lot of audio that isn't even part of the recording

- Tube amps inherently distort sound. This is the "tube warmth" that people talk about; it's just the amp not being very accurate at all.

These aren't "bad" things, but they're also not exactly something to point to for superiority of a medium.