Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Leevi on August 11, 2018, 02:11:51 pm

Title: Cause for this distortion
Post by: Leevi on August 11, 2018, 02:11:51 pm

Any ideas what is causing this type of distortion?


https://www52.zippyshare.com/v/mOLYyAqv/file.html (https://www52.zippyshare.com/v/mOLYyAqv/file.html)

The circuit is like deluxe reverb AB763.

/Leevi

Title: Re: Cause for this distortion
Post by: shooter on August 11, 2018, 08:55:57 pm

I'm not a player, but it sound like strings hitting metal badly, same sound different guitar?

Title: Re: Cause for this distortion
Post by: Leevi on August 11, 2018, 11:37:05 pm

Quote

sound like strings hitting metal badly

I have heard that before and I don't think it is caused by the strings.


I think it could have something to do with a microphonic tube.

I also got to know that the problem occurs randomly.





/Leevi

Title: Re: Cause for this distortion
Post by: pdf64 on August 12, 2018, 02:37:14 pm

It may be a bad connection.
Is this combo?
If so, try a separate speaker cab.
Whatever, use a sig gen to find and induce the problem.
Also chopsticking around whilst the amp is passing a constant tone.

Title: Re: Cause for this distortion
Post by: Leevi on August 12, 2018, 03:15:29 pm

Quote

It may be a bad connection.

Yes, definitely

Quote

Is this combo?If so, try a separate speaker cab.Whatever, use a sig gen to find and induce the problem.Also chopsticking around whilst the amp is passing a constant tone.

It is a combo. Thanks for the troubleshooting methods.
I will certainly apply them when I get the combo to my workshop.


/Leevi