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RE: Losses in Output Transformers

A Dynaco Stereo 770 transformer measured 192 Ohm DCR on the primary; secondary is in proportion, so efficiency is 90%. 300 Ohms with 6.6K will also be around 90%. This is copper loss only; core losses are quite small as the flux level is low for most audio frequencies. There are some additional losses at high frequencies, probably small compared to "mismatch" loss due to parasitic inductance and capacitance.

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  • RE: Losses in Output Transformers - Tom Bavis 09/17/2110:35:26 09/17/21 (0)
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