Self-built guitar tub amplifiers. Showcases design and stories beyond tube amp building, effects pedal building, and related music projects.

Kristijan Kljucaric offers his blue-colored PC board (PCB) designs for high-end DIY projects supported by Pass Labs, including amplifiers, pre-amps, crossovers, and power supplies.

An Excel Crossover Design Tool

The site for audiophiles and/or fanatics.

Includes datasheets and reference articles on audio and headphone amplifiers, preamplifiers, head and phono amps.