Quite a LONG thread. I really have lots to catch up on.

Thanks Tangent, your website is always a pleasure to read. I put the trafo, psu and the PPA in the same case, so there will only be a IEC receptacle. I did ground the OG to the case because I didn't have a isoloated jack(isolated jacks arrive tomorrow) at hand, but the case is only grounded to...

IMHO, It is a decent bulid.

I hope this time isn't some stupid mistakes again. My PPA is completely fine working on the bench. But when I place them in my case(tie the rca jacks to the case I think), the Q3 isolation jfets just blow away as I power up. I checked the PSU and it wasn't shorted to any ground. Desoldering...

Quote: Originally Posted by linuxworks well, not to insult, but I've zapped a few caps when I forgot to discharge them. so its easy for people to forget I did, more than once! as a matter of course, I simply replace all MOSFETS and .47ohm r's. I don't even bother checking the...

Problem solved. Stupid mistake, I installed two TLE2426 in the PPA. Removed one, Okay. Now work on the chasis.

Something is wrong with my ppav2 left channel. It is using OPA627X3, gain=5. The opamp and buffers are a little warm but not hot. I adjusted buffer bias to 30ma in all three channels. But there is no voltage drop across R10 in my left channel and the dc offset is ~330ma(OL to OG). My right...

Quote: Originally Posted by linuxworks when you worked on your power supply, DID YOU DISCHARGE THE CAPS, first? very important.... Yes, I think I am aware of that. Today I swapped the zener diodes, and I used another DMM to check again, no good. Uh, I am completely lost...

Uh, I think something is wrong with my Sigma22s. Today I decided to reflow all the joints in my Beta22 and Sigma22 because I think there are some cold joints compromising the performance(I am so lame..). When I carefully finished reflowing my four Sigma22s, I checked the output voltage, two of...

Beautiful amp!! Congratulations, fault151.

Hi, myk7000 I am quite happy with my Beta22 and HD800, can't give any comment on the rest of the amps though. I just want to remind you that HD800 is very source depend, a good amp can't really guarantee anything.

Arrrrh, SMD parts give me headache.

I reflowed all the joints and the problem is solved now, or at least seems to be solved. Thanks AMB.

Thank you very much for the quick response. I'll do it later and report back.

Umm..... another situation is here. One channel(R-) of my beta22 has some problem. When I turn on the amp, the beta22 capacitors begin to charge, or at least it sounds like, I can hear music from it. After fully charged, like few seconds, it is dead silent! I tested the output pad and it is 0...