Damn. Is there a way to find if previous owner adjusted the voltages in the synth with 8.5V? Just in case to be safe.. I found that near me there are two options of AC adapter - one is "Power supply non-stabilized 9V 300mA 2.1 / 5.5 {+}" and another is "Pulsed power supply 3-12V 0.3A, plug-in", changing polarity is not the problem for me. Which one do you think will suit it better? One adapter is pulsed and another is non-stabilized - i wonder what kind of properties do original Korg Poly 800 charger had.