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Losses in Output Transformers

Tube sheets show typical operating conditions for power tubes, but I have never achieved those numbers in practice. In some cases, the results were pretty far off, maybe only 70% of the output power numbers shown by tube manufacturers. The two examples below represent amplifiers I built recently that produced considerably less than the sheets indicate.






The only explanation I have for this is loss through the output transformers. However, I wouldn't have expected it to be so significant. Is there a typical number for transformer loss in this respect? And all else being equal (impedance and power rating), are smaller, less expensive transformers less efficient, even at midrange? I'm just trying to establish a guide for this, something to help predict real world results at the beginning of a project.




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Topic - Losses in Output Transformers - Triode_Kingdom 12:48:44 09/15/21 (131)
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