Phase 90 Modders ...... a ???? for U

[LoudGreg]

http://aronnelson.com/gallery/Schematics-etc/MXR_Phase_90_board

I did the mods to a Phase 90 by using the above link and now the pedal when clicked on, the pedal has a bumping sound that repfects the speed. It's to the point where my band mates we're almost laughing because we were wondering what is was and when I clicked the pedal off it was gone. This is not a clicking sound which would be worse but more of a low deep bumping noize.

Anyway to get rid of this

It's not heard while I'm playing but if you have a song that has breaks in the song or softer parts it could cause trouble.

[Mark Hammer]

Sounds to me like you may have the bias trimpot set wrong