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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Losses in Output Transformers posted by Tre' on September 17, 2021 at 19:06:42:
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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- Thanks Tre' - Triode_Kingdom 09/17/2119:42:14 09/17/21 (0)
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