Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Leevi on October 19, 2020, 07:13:27 am

Title: Strange noise [SOLVED]
Post by: Leevi on October 19, 2020, 07:13:27 am

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


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


/Leevi

{EDIT: changed thread title -PRR}

Title: Re: Strange noise
Post by: 1blueheron on October 19, 2020, 07:42:16 am

Quote from: Leevi on October 19, 2020, 07:13:27 am

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


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

Title: Re: Strange noise
Post by: Leevi on October 19, 2020, 08:12:43 am

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

Title: Re: Strange noise
Post by: mresistor on October 19, 2020, 10:30:10 am

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

Title: Re: Strange noise
Post by: Leevi on October 19, 2020, 11:33:48 am

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

Title: Re: Strange noise [SOLVED]
Post by: Leevi on October 22, 2020, 10:58:59 am

One power tube was broken.
/Leevi