Tube DIY Asylum: "Singing" Power Transformer by mikeyb Do It Yourself (DIY) paradise for tube and SET project builders.

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Posted by mikeyb (A ) on October 11, 2019 at 07:35:48

I recently built a EL84 based push-pull stereo amp, using a Hammond 710 power transformer (375-0-375 VAC, 345 ma). It "sings", emitting a high frequency tone that is NOT present in the DC output. The rectifiers (two, separate rectifier and filter for each side, common power transformer) are 6CA4s. Configuration is LCLC. Placing a steel sheet near to the transformer seems to reduce the amplitude, so I am guessing that it is a magnetic issue.

Any suggestions?

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