I’ve recently replaced my V25 LDR boards in my DIY balanced preamp with the newly released V3 boards, so these V25 parts are available for sale. They are less than 3 years old, with light use. I have two V25 boards, each with LDRs for 4 inputs, plus the OLED display (which includes the IR receiver and rotary encoder) and appropriate connecting cables. To build a balanced preamp, you’ll need a case, input & output connectors, and a 12VDC power supply. Full documentation for the V25 is on the Tortuga website. The boards both have the latest version 235 firmware, and USB cables for future firmware updates are included. If you’re interested in a single ended project (one V25 board and the OLED display), I might break up the set, please contact me to discuss. $375 for the complete set.