Jackson PS500SM is a multi-voltage wall wart, to suit a variety of sizes.
While it’s not up to the challenge of running a bunch of guitar pedals, this multi adaptor will be able to get you out of a sticky situation if you can’t find the exact manufacturer specified plug pck.
The 9V and 12V settings allow for 500mA, while the lower settings (3V, 4.5V, 5V & 6V) provide 1A.
There’s a switch on the back of the wall wart to select voltage, and polarity is selected by aligning the word TIP on the side of the plug with the positive or negative sign on the side of the plug as required for your appliance.
Plug sizes: 0.7mm (OD 2.35mm), 1.4mm (OD 3.5mm), 1.7mm (OD 4mm), 2.1mm (OD 5mm), 2.5mm (OD 5.5mm), 3.5mm male
