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joval - 2019-06-28 8:14 AM
I would venture a guess that it is an "unregulated" power supply and probably outputs 9 volts with no load, 6.5 volts with its designed load. You can check with a voltmeter
(plugged into the wall mains power but not to any load
). They are, usually, just a basic transformer without any voltage regulator circuitry, usually you can tell just by looking at them and they are heavier for their size. Either that, or the Gods are smiling on you once again. Take that bow, kind sir.
I am sure that you are probably right; it's the effort of finding my multimetre you see that is going to impede me from actually testing it. It's "somewhere".