It might be good to mention what could serve as a generic current-limiting resistor, or range of resistances.
For bullion coin electrodes spaced three inchesd apart, any resistor from 100 kilohms to 190 kilohms would work for long brew times, with end-point indicated by the appearance of a metallic film floating on the surface. The color-code bands of 100 to 190 kilohms would be brown for the first (nearest one lead) and yellow for the third. The second color band is not critical. In a worst-case scenario, a suitable resistor can be identified this way and removed from a piece of worthless old electronic junk. Matthew
