Depending on what we're talking about here, most devices will tolerate +/-15%, or in your case, 7.65v to 10.35v. A 6V power supply will only give the device 66% of the power it's rated for (not enough).
Even if you could find an adapter that would fall within the 15% tolerance, it's not a good idea to try it. A multi-voltage adapter can usually be purchased for cheap at your local RadioShack or if you're feeling lucky, you might be able to find one at any place that recycles electronics (Goodwill or any local recyclers).
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No, the mA rating of adapters is the maximum amount of load that can be drawn from the adapter. 1 amp is equal to 1000 mA. By replacing a 800 mA adapter instead of using a 1000 mA adapter is limiting the connected devices load by 200 mA. If the connected device draws 800 mA's or less then the adapter will work.
No. Your portable radio needs 800mA to operate. Your adapter can only produce 400mA. If you make the connection the adapter will rapidly heat up and probably burn out.
Yes a device will only draw the amount of current it needs if the voltage is the same it will draw the same amount of current. Since your going to a power suply with a larger max current you should be fine..just don't step up the voltage.
Yes you can, as the pedal draws only 35 mA, which is less than the maximum current the supply is capable of delivering.
whammy 2 specs. ps750 class 2 transformer Ac-Ac power supply input: 120vac 60Hz 12w output 9v AC 780mA