[Hallicrafters] HT-37 selenium rectifier replacement..HELP!!!!

[Paul Mobley]

Please, can anyone give me detailed info on replacing selenium rectifier in my HT-37, with diode. I am a beginner with electronics and having real trouble trying to understand the whole bias supply circuit. I don't know what value of dropping resistor to use and am confused as to weather the resistor should go to the anode or the cathode side of the diode. The whole negative voltage bias thing is very confusing. Please help!

Thanks,
Paul 

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