Ferro-resonant xformer conversion?

Assuming you have a ferro-resonant transformer targetted for 60Hz operation and you want to convert it into 50Hz (assuming current load is the same).. Question: - if one just maintains the RC value, the tank would still resonate and perform its function of maintaining load and line regulation? e.g. originally R1C1 = 60, now we want R2C2 = 50, if we retain the original external caps, we have: R1C = 60 and R2C = 50, therefore: R2 = (5/6)R1 which means that R2 is just about 17% smaller than R1. Bottom line is: Does simply measuring the primary winding's resistance and adding a series resistor network which decreases the total resistance to 5/6th of the original, work? Sorry if all this is really crap.. My magnetics/electronics is pretty rusted, unfortunately. p.s. samples of a 5/6th resistor network would be welcome :-) Thanks. /wai-sun