Interfax HP-1 Harmonic Percolator – Early silicon version

Interfax Harmonic Percolator dual NPN Si df9414a0ba6f

 The earliest version of the infamous HP was actually a dual silicon transistor circuit. It also had a few addons and a few big cap fifferncies compared to the later Ge/Si version. Not sure how it sounds but I guess some of might be interested to to try this one out. The 2N3565 transistors had … Read more