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Tube amp buzz (amp, not speakers)

Hello - 

Almarro a318b makes buzzing sound at random: sometimes it does, sometimes it doesn't, completely unpredictable. The buzz comes out of the amp itself, like a transformer buzz; the sound out of speakers is completely clean. 

I'll appreciate any ideas - what causes it, what to do?
boriso

Showing 2 responses by millercarbon

millercarbon's avatar
millercarbon
12,531 posts
 
Thank you all so much. I don't know the first thing about electronics, so it seems like I have two options: getting an Emotiva CMX-2  or taking it to a technician, at least for a comparable cost if not more. What would your inclination be?

This is another one that is known to eliminate DC offset transformer hum

https://avahifi.com/products/humdinger-dc-line-blocker
millercarbon's avatar
millercarbon
12,531 posts
 
The most likely cause is DC offset. Many common appliances connected anywhere in your house can be a cause, making it seem random. https://www.pooraudiophile.com/2015/03/how-to-fix-dc-offset-and-transformer.html
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