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You are right, Plus is the Cathodes. Because Plus in teh Seleniums shows the Output Voltage polarity, not the Pos/Neg Electrode (Anode Cathode), as the Diode or teh Bridge has Positive Voltage coming out from Negative Electrodes (Cathodes).

So, in Seleniums, the B+ (and the positive of the electrolytic cap) will go to the pin marked "+" and the one marked "-" will go to the negative (and possibly Chassis in he later models).