I would have to agree with those who voice a concern regarding the amperage rating of the converter you are using; when using a converter for my Waldorf Wave, I noticed that the properly spec's converter weighed at least 5 pounds - and cost a few hundred dollars - not your typical Off the Rack variety....
Gary
On Jun 23, 2011, at 7:28 PM, "nicholas_kent" <zaum@...> wrote:
What I've heard is that the 50/60hz issue mostly manifests itself in simply inaccurate or different timing since lots of older gear used the cycles for timing and AC motor speeds. Doesn't come to bear in your case, but certainly Japanese synths will never run into an issue since half of Japan uses 50 and the other half 60.
One thought occurs that maybe your present converter does not deliver enough amperage. Though I have heard of "travel" converters that really put out bad power in terms of specs.
I guess rather than the 50/60 issue that might turn out to be a red herring, maybe you can test some other converters by borrowing or perhaps finding one with a favorable return policy.