Many DIY electronic enthusiasts are building a great Nutube preamp kit from Nelson Pass.
This Application Note provides one of the ways to power the kit and to integrate the VCU volume control board with the B1 Korg preamp circuitry.
Building a good audio line stage is an art of its own. The BA2018 circuit presents a great match for the MUSES volume control chip. This Application Note provides guidelines on how to integrate the MUSES Volume Control boards with the BA2018 line stage.