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I think the fact still remains, that you are running the set @ 50HZ instead of 60HZ, even though you are using a transformer to reduce 230 volts to 120 volts. In past practice, the electrolytics, had to be increased in value. I guess, that's the reason the US adopted 60 HZ, as our design standard. You probably have to increase the values of the originals, by at least 20%. That includes the voltage doubling cap, that is before the power supply diodes.
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