Strange noise [SOLVED]

[Leevi]

Any idea what is causing this noise. The amp is 5E3.


https://www101.zippyshare.com/v/YVuV9GuV/file.html


/Leevi

{EDIT: changed thread title -PRR}

[1blueheron]

Any idea what is causing this noise. The amp is 5E3.


https://www101.zippyshare.com/v/YVuV9GuV/file.html


/Leevi

Is this a startup on a new build or is this a problem that just showed up in an amp that has been previously without problems?

[Leevi]

It is a 5E3 clone without mods. Unfortunately I cannot do any troubleshooting since the amp is not yet at my place. No problems before and this issue exists after the amp has warmed up.

/Leevi

[mresistor]

Gee.. sounds like a soundtrack to a horror movie.   

[Leevi]

Yes, one reason might be that 50Hz heater pin is in contact with plate.
/Leevi

[Leevi]

One power tube was broken.
/Leevi