There is much discussion of type and testing the success of beads after the rectifiers, through the middle of this thread.
Standard Silicon Diode Rectifier's VS Ultra Fast
Standard Silicon Diode Rectifier's VS Ultra Fast
I'd suggest Laird LFB159079-000 (link to sales page including datasheet) since it is optimized for the very low RF frequencies at which transformers produce oscillatory ringing, when stimulated by rectifier diode shutoff impulse. Notice that three turns thru the bead gives much MUCH better results than one turn, per datasheet figure.
Jim Brown has several papers that deal with ferrites.
Audio Systems Group, Inc. Publications
Audio Systems Group, Inc. Publications
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