any 9v with the correct polarity (- inside +on the outside i think) that supplies enough amperes (250 milliamperes minimumi think) will work fine. As long as the voltage matches up, 9v DC pedal with a 9v DC power supply, you will be fine.

In most cases, you cannot use a 12V adapter to power a 9V guitar pedal. Using a 12V adapter on a pedal designed to only handle 9V can completely destroy it. ... Voltage is only one part of the picture and even if you get the voltage right, it's possible for a power supply to ruin your pedal.

You only need to have at least enough to give the system what it wants for amps. But other wise, 9V 1A, or 9V 10A - both will work just the same. ... 10v pushes more power into your system. Voltage commonly equates to pressure, if you put too much pressure it could cause a blow out.

No! It might work for few minutes, but eventually the voltage drop on the internal regulator will cause the circuit to overheat and burn. It could be however, that your adapter has an internal resistance causing the voltage to drop to ~5V, so it could work in this case, if the adapter can supply the needed current...