Bottlehead Kits > Mainline

Intermittend high pitch noise

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bergurbrag:
Hi !
I am loving my Mainline amp, but there is a intermittend high pitch noise on the right channel. It comes and goes. It is no a high sound even with the volume turned all up but it is annoying specially when listening to some types of music.

Please help me troubleshoot this issue.

With regards, Bergur Bragason

Paul Birkeland:
Can you describe what the noise sounds like?  If you move the amp to a different room, is it still present?

bergurbrag:
Hi !

Thank you for your most helpful answer. I tried it in another room with another DAC, 300$, and no sound... funny... and again in my listening room connected to my NAD M33, which is an 5000$ unit, I got a little bit more low hum but no high pitch noise. This time I eliminated an extra extension cord.

So mains noise is a real thing, not snake oil

Paul Birkeland:
You could also give this mod a try:
https://forum.bottlehead.com/index.php?topic=11676.0

bergurbrag:
Is this a possible sollution for my Mainline issues ?
See attached photo

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