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Bear in mind that the selenium stack needs to be taken out of circuit electrically, though you probably want to keep it in place for aesthetics. You can still use one of its lugs for a tie point. The + sign on the stack is in fact cathode*. Banded end of Si diodes is cathode. Series resistance probably not needed since the xfmr winding contributes that.
*Seleniums conventionally show a + sign on the cathode for some obscure reason.
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