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In Reply to: RE: Losses in Output Transformers posted by deathtube 667 on September 17, 2021 at 14:56:12
TK is wanting to know how the makers of the tubes came up with the data in the data sheet. What were their methods, etc.
You pointing out that TK is not doing things the MLP approved way is not helping or in any way answering TK's question.
You sound like a broken record. You just repeat the same thing over and over again even when it's not relevant to the question.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
I do appreciate the fact that a few people offered typical numbers for transformer loss. But then, that information leads directly to what I thought would be a fundamental concept - how did manufacturers test these tubes to arrive at the output numbers? In some cases, they even provide graphs that plot distortion and output power over load impedance, or over anode/screen voltages. I know it's not much in terms of dB, but it's disappointing to build a 35W amplifier, only to see it clip at 30W. What's worse is that the output rating was claimed many years ago, before line voltages increased to 122-125VAC. Because of that, plus the low ESR of modern caps and a few other details of the work, I had actually expected more than the original spec. 40W wouldn't have surprised me, based on voltages and data sheets. The thing is, how can you set a target for a project under these conditions? Shouldn't the data sheets represent real world numbers? I'm stumped.
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