So I just finished my first echo base, which was also my first ever build, and I must say that it is one sweet sounding delay!
I initially had some problems with the feedback pot, it didn't really do anything, and if it was turned all the way down, something would short in the potmeter.
I traced the fault back to a missing cut on the strip board, which meant that the feedback CCW was connected directly to +9V.
Other than that, the build actually worked pretty well, I had to change the feedback resistor value to 100K, at 20K and 37K it was either no feedback or selfoscillation madness, no middle ground.
Now I just need to cram it into a enclosure, unfortunately, the pots I ordered are waaay to big for the enclosure, so that will be a project for next week.
Thanks for a great design slacker!