I found a non-Atari ac adapter with the stereo plug. The specs on the adapter state 9.75 V DC and 650 mA. I thought it might work. The tip is positive and negative below the black line. However, when I measure the voltage with my VOM, it reads 13.65 Volts. What is the voltage range the console will tolerate and what is the typical variation of the Atari AC adapter voltage? I don't want to power up my console with it until I'm sure it won't burn it out!