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The problem with 99.9% of all wall-wart adapters is that they are NOT regulated, some straying up to 13 volts or so, causing Hum and horrible tone. Enter the Fulltone FPS-1 (200 ma.) Regulated adapter....dead quiet, and exactly 9 volts no matter what your wall AC is putting out. This has the standard 2.1mm x 5.5mm end with a Negative Center Pin and will work with most Boss, Ibanez, and most other pedals.

For use with most pedals including FD2, OCD, Bassdrive, UltOct, 70pedal, CF-1, etc