Rustler, I use the Aesthetix Calypso with an Esoteric K-05 and I enjoy the combination a great deal. It gives you the opportunity to tailor the sound by tube rolling.
The gain of the Calypso can be reduced by 12dB by switching two pair of jumpers in the preamp. This can be done easily by the user. Instructions are in the manual.
The gain of the Calypso can be reduced by 12dB by switching two pair of jumpers in the preamp. This can be done easily by the user. Instructions are in the manual.