Collusalus "sproing"

[pulsarx]

I have the PCB Collosalus (-117 MXR flanger)
I can not remove the "sproing" making bias settings, feedback and clock.
To remove it I have to adjust the trimpot the feedback at the top of the left.
Doing this flanger effect is eliminated.Connected to 9v. dc.
Not to do.
Can you help?
Thanks and regards.

[dondougie]

Have you tried the substitutes for D4/D5 and C26? If that doesn't work, try it with a 12V supply. I had the same problem and it removed all the noise.