Diode upgrade

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What purpose is served by this? The original design is adequate and you gain nothing by replacing a perfectly good diode. In some cases, a faster diode is not a good thing but I believe this circuit operates at power line frequency so speed is immaterial for the most part. Perhaps the forward drop with bigger diodes will be a few millivolts less but that amount is lost when you are rectifying 50 Volts or so.
 
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