Jimmyno a écrit :
I had similar issues on my Steavens preamp.
I asked to Pierangelo form Masotti Custom Amplification about it and he told me it was just a tube which was amplifying a natural character of the preamp.
All tube/analog amps have different levels of "ghost notes", harmonics, overtones and undertones, and things like to ones you have recorded.
Some modelers don't, because the look for a more clean sound, or just because they cannot recreate this kind of behavior.
Anyway, in my experience those "nuances" help to give a fuller and organic tone in the mix.