Converting Yamaha 110 V AVR to 220 V with out transformer?

jagdish_p

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Has any one tried converting the internal transformer of Yamaha AVR 667 from 110 V input to 220 V input.
Is it a simple changing of Transformer input winding tapping from Parallel to series?

Thanks.
 
A beautiful, well-constructed speaker with class-leading soundstage, imaging and bass that is fast, deep, and precise.
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