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				AC adaptor - how ro replace
			 
 
			
			We have a rather nice pair of fibre optic illuminated trees and the AC adaptor on one of them has failed.  It resembles any number of old Christmas light adaptors we have around the place so I'm wondering if one of them might be a suitable replacement.
 The plug states:
 
 Primary 230/240v
 Secondary 6v  500ma
 
 There's also a diagram which shows that the metal plug end has a -ve outer and +ve inner.
 
 - -----------(o---------- +
 
 Does that make sense?
 
 Is finding a suitable replacement as simple as finding one with roughly the same numbers and plug end size/polarity?  Presumably it's important not to use an adaptor with higher than 6v output.
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