Crack Crackling

[magicalmysterytour]

Hey guys,

I have a moderate crackle in the right channel with my Crack kit (no speedball). I built the kit a few months ago and it made sound but later developed a crackle. Thinking that it was a bad tube, I waited for a new tube (which didn't fix the problem). When I flipped the top plate over to look at the circuit I saw the plate resistor on the right channel is charred and the B+ wire coming from the 6080 is slightly charred. Could this issue be more then a bad joint? Any ideas?

Matthew

[Paul Birkeland]

From what I can see in your photos:

5L is unsoldered.

4U/4L have not been heated enough for the solder to flow out.

3U has not been heated enough for the solder to flow out.

3L looks unsoldered.

2L is a cold solder joint (needs more heat)

The green wire attached to B7 in the lower hole does not look to be soldered.

The joints at B8 look cold, but I can't see them all the way.

B2 needs more heat to flow out.

The wire at 9U needs more heat/solder.



I would need more photos to get an idea of what happened to the 22.1K resistor.  Does it still measure at 22.1K?  This resistor won't char unless you also have a voltage problem in the amp, and knowing what voltages are off could sure be helpful.