Battery backup question for AC3 pro

[kbecker]

Does anyone know off hand if the tip is positive or negative for the alternate power supply for an AC3pro? I am thinking of building my own battery backup.

Thanks.

 

[kbecker]

Nevermind, I just did it the old fashion way of trial and error.

 

[clp]

It uses a 9V DC supply. 3.5 mm phono plug, tip is positive.

Curt

 

[kbecker]

I added a 9v battery as a backup. I didnt want to use a normal power supply.