help me please

[pwdrive]

Yes that's why I posted the diagram for a similar model as it is clearly marked field (feld), where as it is not so on the OP's diagram, yes definately a candidate for O/C, not sure what the working HT is on the OP's radio is, peak can be worked out from 220v RMS less say 25 volts for the selenium rectifier drop which would put the HT at around 270 v at the reservior (unloaded)

Lawrence.