There's a simple gain mod for the Calypso which in my system cured the noise problem. It's just flicking a couple of circuit board switches if I remember, takes but a minute to do. Since then the unit has been dead quiet into my 106db speakers.
Occasionally I'll come across a noisy NOS tube, but you can't blame the preamp for that.
Also, Aesthetix are a great company to deal with in my limited experience.