New tube amp: the Cayin HA-1A MK2
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no, on the two channel, with the 12au7 original it's the same, when I turn it on the noise is loud after 15-20 sec it decreases
I know someone who bought the HA-6A it has the same noise.
Okay, so not the tube. Your in Europe right? So then 50hz could be mains noise.
 
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yes i m in europe, and i think it's a 50hz, the power tubes are heated alternately?

Thank you for the link
 
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Cayin Stay updated on Cayin at their sponsor page on Head-Fi.
 
http://en.cayin.cn/
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