HELP to Pass Labs D-1

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Good day
I have a model of Pass Labs D-1. I have a problem with noise in the right channel after switching the unit on the network. "Click" it appears after a long shutdown of the apparatus of an electrical outlet, which disappear after heating apparatus for 5-10 minutes. After that, the noise is no longer there, if not turn off the unit from the electrical outlet. Did someone such problems and that it can be? Thanks in advance!
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.