[MrFixr55]

+1 on what Rod B says. I would use a 1K 10W resistor to replace the field coil. Better to raise the capacitance after the resistor than before, but per the RCA Receiving Tube Manual Ver RC14, 1940, for a 5Y3, an input cap in the filter (Cap between cathode of 5Y3 and center tap of transformer, the most negative point of the supply) of up to 40UF is tolerable. Per the manual, "When a filter input capacitor with a value greater than 40 MFD (uF) is used, it may be necessary to use more plate supply impedance than the minimum value shown to limit the peak plate value to the rated value".