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110v to 220v transformer.... I have an honest question.
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<blockquote data-quote="Ampdog" data-source="post: 834267" data-attributes="member: 144"><p>Hi Judy! (Hey Jude ....!!)</p><p></p><p>All transformers have an efficiency, normally somewhere 85 - 90%, which means that some electricity is lost. Transformer getting luke warm, that sort of thing. There is also internal winding resistance (that waste is what is generating the heat), so that output voltage will 'sag' slightly under load (your car loses speed uphill).</p><p></p><p>That said, one must stay practical regarding specs. While respecting your convictions regarding power supplies, this factor is often an overrated one. (Yes, a power sullpy should be well-designed vis-a-vis where it is to be used, but most of that is old hat and there is no excuse these days for poor designs.</p><p></p><p>But there I go tutoring again .....</p><p></p><p>So provided a flea power component is not used beyond its means and such, a step-up transformer should have no audible effect. "Bigger-is-better"? No; a 1KVA transformer to feed a 100W power supply can only have academic advantage. Determine what the equipment's required power is and buy accordingly - maybe 20% over-specced just to allow for possible poor transformer design, otherwise feel comfortable.</p><p></p><p>[I occasionally mention this example I experienced of over-design. The externally placed power transformer for this valve pre-amp was housed in a separate enclosure. The pre-amp needed maybe 8W of electricity. The h.t. supply was regulated internally. </p><p></p><p>The separate transformer was ....... a 1KVA toroid with thick cable, huge switch, 10A output socket, etc. :???: ]</p></blockquote><p></p>
[QUOTE="Ampdog, post: 834267, member: 144"] Hi Judy! (Hey Jude ....!!) All transformers have an efficiency, normally somewhere 85 - 90%, which means that some electricity is lost. Transformer getting luke warm, that sort of thing. There is also internal winding resistance (that waste is what is generating the heat), so that output voltage will 'sag' slightly under load (your car loses speed uphill). That said, one must stay practical regarding specs. While respecting your convictions regarding power supplies, this factor is often an overrated one. (Yes, a power sullpy should be well-designed vis-a-vis where it is to be used, but most of that is old hat and there is no excuse these days for poor designs. But there I go tutoring again ..... So provided a flea power component is not used beyond its means and such, a step-up transformer should have no audible effect. "Bigger-is-better"? No; a 1KVA transformer to feed a 100W power supply can only have academic advantage. Determine what the equipment's required power is and buy accordingly - maybe 20% over-specced just to allow for possible poor transformer design, otherwise feel comfortable. [I occasionally mention this example I experienced of over-design. The externally placed power transformer for this valve pre-amp was housed in a separate enclosure. The pre-amp needed maybe 8W of electricity. The h.t. supply was regulated internally. The separate transformer was ....... a 1KVA toroid with thick cable, huge switch, 10A output socket, etc. :???: ] [/QUOTE]
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110v to 220v transformer.... I have an honest question.
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