micogit Posted March 18, 2021 Share Posted March 18, 2021 Hy, I'm having problems with my amp when powering amp. Here is the link to see what kind of noise my amp is making https://vimeo.com/525662331 my clean channel is no more clean, now it sound like fuzz. I replace the preamp tubes, reset the amp to default settings but it didn't help. What should I do? Is my digital part creating this problem? Please help Quote Link to comment Share on other sites More sharing options...
psarkissian Posted March 19, 2021 Share Posted March 19, 2021 Power tube element is failing. Have a Line 6 authorized service center deal with it, replace and properly bias and check the amp. Don't do this yourself, the shock hazard is too great and dangerous. Quote Link to comment Share on other sites More sharing options...
guyatone Posted March 22, 2021 Share Posted March 22, 2021 On 3/18/2021 at 5:50 PM, micogit said: Is my digital part creating this problem? Plug your guitar into the "Power Amp In" on the back of the amp. If you still hear the same noise, it's the tube stage that needs service. The Preamp Out and Power Amp In are exactly right between the digital and anlog boards of the amp. Any signal coming out o the Preamp Out has been touched only by the modeling stage but not the tube stage, and any signal going into the Power Amp In will only be going through the tubes. Quote Link to comment Share on other sites More sharing options...
micogit Posted March 23, 2021 Author Share Posted March 23, 2021 Hy, I plugged my guitar in power amp in, the same problem. I can hear the same noise when my guitar is not even plugged in. You can see it here: https://vimeo.com/528027999 Do you guys still think this is the bad power tube? Thanks Quote Link to comment Share on other sites More sharing options...
psarkissian Posted March 23, 2021 Share Posted March 23, 2021 Yes, tubes. When was the last time they were changed out? Quote Link to comment Share on other sites More sharing options...
micogit Posted March 23, 2021 Author Share Posted March 23, 2021 I bought this amp used so I'm not pretty sure when previous owner changed it. I will replace power tubes this week, thank you for your help Quote Link to comment Share on other sites More sharing options...
psarkissian Posted March 23, 2021 Share Posted March 23, 2021 have it done by a Line 6 authorized service tech, they know what tubes to use and bias to set. Quote Link to comment Share on other sites More sharing options...
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