Noise on one channel with certain kinds of music only

[Al Campone]

Help!!

I finished assembling my bottlehead crack some weeks ago and had a couple of really wonderful hours listening to my music -- until.... I stumbled over one song where some (yes: a faint CRACKle) noise occurs.

The noise is reproducable, but occurs only during certain, rather loud passages of the song. It is a rather ambient song (Lustmord: Babel); I exchanged the main tube without effect and resoldered (as good as I could) - also without effect. The noise is not in the song itself (tried with the same headphone on a different amp).

Is there somebody with a similar problem?

Would it help to install the speedball upgrade or would this just increase the complexity of the problem?

Thanks a lot for any helpful comments...

BW

 

[Paul Birkeland]

This is almost certainly a flaky solder joint, I would go over them very carefully with your iron, being sure that they are all flowed and tight.

-PB

 

[Al Campone]

I just did that... but maybe not thorougly enough... is there a part of the circuit that is more likely to produce this kind of problem?

Thx!!
C

 

[Doc B]

Loud passage, just one song - you're probably just clipping the amp.

 

[Al Campone]

Hm.... I don't think so because the noise seems somehow decoupled from the music. I would expect that clipping rather produces a distortion of the music itself?

Will check if the noise vanishes with lower input or output levels and if it makes a difference if input channels are exchanged...