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Rectifier tube buzz/hum on DAC 2.1 and Kit 1

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Hi,

I have AN Kit Dac 2.1 and Kit 1. Quite often (not always) I hear slight buzzing/humming sound from their respective rectifier tubes. It does not come from the speakers nor transformers.

Would anyone be able to suggest as to the possible cause for this?

Thank you very much in advance.



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