EF86 36 watt start up buzz

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POWDOG
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EF86 36 watt start up buzz

Post by POWDOG »

Hi all. Just bringing up a new 36 watt build with EF86 preamp. At about 50 volts on the variac I've already developed a buzz. Sounds like 60 Hz, not filter hum. Ideas where to start looking? Thanks.
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dotfret
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Re: EF86 36 watt start up buzz

Post by dotfret »

Try grounding the EF86 screen via a 0.2 uF paper capacitor, and read the other hints in the application notes on this data sheet -
http://www.mif.pg.gda.pl/homepages/fran ... 29_GEC.pdf" onclick="window.open(this.href);return false;
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