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Re: Hissing from Quad 63s - reason?

Hi, thanks for the info.

You say Late versions ESL63 Monitor and the newer 98/05 series of speakers do have some enhancements in the power supply to keep excess leakage under control

Do you know what kind of enhancements that might be? Perhaps lowering the HT? I know the 57 had a lower voltage tap (590 vs 610) on the HT transformer probably for situations like this.

It makes me wonder what factors might control this behavior when you say it varies from unit to unit.

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  Kimber Kable  

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