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Audio and Video Talk
Valves / Vacuum Tubes
Single Ended Triode KT88
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<blockquote data-quote="Ampdog" data-source="post: 765708" data-attributes="member: 144"><p>It's actually quite straightforward; for small resistive changes the output power is related to the total resistance in the circuit.</p><p></p><p>Taking 5% copper loss (5% wire resistance - on the high side for valve transformer copper loss), the power loss will be 0,45 dB (rounded) by simple Ohm's Law. Coming down to 3,5% copper loss the power loss will be 0,31 dB - thus a difference of 0,14 dB. Not even the highest carat of golden ear will claim to hear that. (This excludes some slight phase angle involvement, resulting in <10% of that, etc.)</p><p></p><p>That is also why I consider copper loss low on the scale of importance in the design of an OPT. In valve design there are far more important factors to consider than e.g. equal primary resistance of push-pull OPTs and such.</p></blockquote><p></p>
[QUOTE="Ampdog, post: 765708, member: 144"] It's actually quite straightforward; for small resistive changes the output power is related to the total resistance in the circuit. Taking 5% copper loss (5% wire resistance - on the high side for valve transformer copper loss), the power loss will be 0,45 dB (rounded) by simple Ohm's Law. Coming down to 3,5% copper loss the power loss will be 0,31 dB - thus a difference of 0,14 dB. Not even the highest carat of golden ear will claim to hear that. (This excludes some slight phase angle involvement, resulting in <10% of that, etc.) That is also why I consider copper loss low on the scale of importance in the design of an OPT. In valve design there are far more important factors to consider than e.g. equal primary resistance of push-pull OPTs and such. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Single Ended Triode KT88
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