I just bought a philips 1960's/70's power supply with three voltages 6,7.5,10 volt but when i test it the voltage is 6.9,8.5,and 10.4 why is this i changed the caps but still the same, before i start using this power supply is the voltage dangerous to use on my box's??? or are these early power supply's just like this?? if not how can i repair it?? it seems pretty simple and i have the skill to replace componants any help will be great thanks