I had to deal with this problem when I moved from the USA to France for a 3 year assignment. My QUAD and ReVox equipment was no problem, as all the pieces are equipped with user settable input transformers. My Pioneer Elite equipment (two M-91 power amps, C-72 control, F-93 tuner, CT-93 cassette deck, SP-99D surround sound processor and DV-38A DVD/CD player) was a bit more of a problem. I simply purchased a 2kW 220V-110V step down transformer before I left the States. Everything works perfectly. I then purchased a used Krell-250 power amp whilst on a recent vacation in Singapore. No problem, the dealer simply set the internal jumpers on the transformer to 110V (from 240V). The Krell works perfectly in France. I then purchased, on Audigon, a used Krell HTS, which I collected when I was back in the States on business. I plugged it into the 220V-110V transformer and got a Frequency error message. Apparently, Krell now equip all their microprocessor controlled equipment with a mains frequency sensing chip, set to either 60Hz or 50Hz. Because my HTS is a US model it is set to 60Hz and will not work on European 50Hz mains (even when transformed down to 110V). Krell informed me my local Krell dealer in France needs to change this chip to a 50Hz version. I am currently waiting for this to be done. Incidentally, this is Krells (I believe Martin Logan do exactly the same thing) way of preventing importation of cheaper US models into other countries. With the exception of synchronous turntable motors there is absolutely no sound technical reason for designing equipment to work only on 50Hz or 60Hz.
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