
H2 Harmonic Generator
This is Nelson's DIY H2 Harmonic Generator, Version 2.
This kit consists of one PCB and two selected J113 JFETs, good for stereo operation.
You can read about the project here:
After reading these articles, you might like to continue on and discuss this project in the H2 thread at diyAudio or the H2 Version 2 build thread.