The winding is center tapped. It generates +/-24.5 volts DC. Based on it being a capacitor input filter, we need a peak voltage about 1 volt higher to account for the droop of the capacitor and the .7 volt drop of one silicon diode...
Since we need 25.5 volts peak then we need that divided by 1.414 RMS out of ONE side of the center=tapped secondary... So our secondary voltage is 18 volts either side of center.
You will need a 36 volt center-tapped secondary. Here is one that would work:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=162J36-ND
This has two 18 volt windings that you would connect in series and a dual primary you can set for either 120 or 240 input. About $19 US.
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