I think of saying it’s all the mind... but then I play my ‘64 Casino with its original P90s and they have a depth, quality, bite and airiness that my similar spec modern P90s do not have. They sound more focussed and narrow. I put some of it down to looser windings and dried out wax potting and magnets with 50 years of natural aging. The guitar is a system too, so the old, dried out woods and softened edges all play their part. Microphonics colour the tone a lot.