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I have a 220V to 100V step-down transformer. When I looked inside, it's apparently an autotransformer (one winding with taps) marked on the lugs "0, 52, 93, and 215" (I gather input AC is applied across "0" and "215", with output taken from "93"). Would I have any problems inputting the 100VAC line into the 93V tap and taking the output from the 215V tap to raise the voltage to 220VAC-ish? I read on wikipedia (Japan) that an autotransformer works best when the voltage difference is not that large but there were no specifics beyond that. On wiki in English, it says "(b)ecause it requires both fewer windings and a smaller core, an autotransformer for power applications is typically lighter and less costly than a two-winding transformer, up to a voltage ratio of about 3:1 - beyond that range a two-winding transformer is usually more economical" but I'm not sure what the ratio means. Thanks.
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It should work. Hopefully the wire size is adequate for the lower taps to maintain the same VA rating (as the voltage goes down the current must go up). Be mindfull of which side is connected to neutral, the side of the line near ground. It would be a good idea to fuse both input and output.WARNING! Musical Instrument amplifiers contain lethal voltages and can retain them even when unplugged. Refer service to qualified personnel.
REMEMBER: Everybody knows that smokin' ain't allowed in school ! -
thanks much. It already has a 4A fuse so I guess I need to add another one. The core size is about slightly smaller than the PT on my Marshall JCM800 50W. What I could see of the wire wound was that it appeared to be the same thickness throughout. I want to try powering the Marshall from a higher AC voltage since supposedly it makes some subtle difference and I remembered I had this thing.Comment
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