Just can't read is all. I fixed the cap value, reran the simulations and added the new plots to the web page. I also adjusted the circuit gain to unity. The data looks OK now. Thank you to all. http://www.musicsynthesizer.com/Diode%20Phaser/Diode%20Phaser.html No one else has the Tau Systems schematic? > > I believe JH's schematic says 10n.