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Question:

Are all AC power cables for electronics that are the same voltage and amperage the same size?

I am looking to replace a broken power cable for my DigiTech RP1000 guitar effects board, but I am curious as to whether I need to find a cable specifically for this device, or if I can look up any cable with an output of 9V AC; 1.3 Amps.

Answer:

Hi at such low current and voltage it really doesn't matter that much.
Hi at such low current and voltage it really doesn't matter that much.
Flexible cables for use at low voltage e.g. for mains adaptors and speakers, are probably good for at least 100 volts. They are usually rated for current, and are well over-engineered, so anything rated from 1 amp up will work fine. I wouldn't use a cable rated for more than, say 3 amps because there will be more chance of a thicker cable shorting out in the plug - there isn't a lot of space between the terminals.
What you are calling a cable is actually a transformer: high voltage AC in, low voltage AC out. If you can get a 9V transformer rated at 1.3A or more then electrically it should work. What the connector will be on it is anybody's guess.
Hi at such low current and voltage it really doesn't matter that much.

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