[FallenAngel]

Hi guys,
 
I'm debugging a Beta22 and Sigma22 and could use a little extra info.
 
The Sigma22 had the output shorted and now instead of +/- 30V, it's outputting around +/- 5V. I started looking at http://www.amb.org/audio/sigma22/sigma22_200_voltages_30v.pdf - Voltages expected, and I'm seeing about 12V after D5, 47V on the input, 44V on both gain and drain of Q13, no voltage across R4.
 
I'm assuming the mosfets are dead, but I wanted to see if there's a good chance that some of the BJTs are also fried before I replace the mosfets.
 
I'll add info regarding the Beta22 after I get the Sigma22 sorted out.

 

[FallenAngel]

Replaced MOSFETs, no change.
Which parts should be the most likely failed ones?

 

[stixx]

Difficult to make a guess when the output was shorted.
 
It could still be the CRD's (current regulating diodes CR1, CR2) that are quite fragile.
But I would ask my questions over at the Amblabs forum... Ti Kan is present there and usually replies
in a matter of hours.