Hi there,
first of all: Thanks to JPK and the team for the great quality of your modules and the build guides! Unfortunately, some problems came up while building the TS500, and I don‘t know how to solve it. I measured high distortion in the output signal, even with unit switched off! Input signal was sine, 1kHz, 1Vrms. I checked the audio interface and the cables, there was no problem. Sending in a mixed signal (2 sines or more complex material like e.g. an 808 drumloop) causes a lot of sidebands and interference.
I already did all the basic checks (proper components and polarization), resoldered everything, even tested all opamps (one was faulty, I‘m afraid I killed it while testing, but temporarily replaced it by a 072), but the problem persists.
Any hints?
Thanks J.