Phatboy PSU polarity

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Low

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Got a couple of psu's lying around to power a Phatboy, but they are both different. One is + inside/ - negative outside, the other is - inside/ + outside.
Can someone confirm the correct polarity for me please, thanks.
 
if it's an ac to ac then it wont matter, look on the back and it will tell you (i.e. 115 input/ 12 vac out)
 
i would try the tip positive. U can always crack it open and look
 
altitude909 said:
i would try the tip positive. U can always crack it open and look
Click to expand...

Opened it up about a month ago and it's not obvious, no board markings - can't remember what the two components are that the + and - inputs go into first.
 
just look at which one connects to the ground plane, that will be the -
 
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