Antistar

Well i did just that not long ago, after i got both the FETs blow up on me... Unfortunately it took off all the traces between them and the zeners so i had to adjust: No vert pretty but gets the job done, basically at least... I have tested all the zeners and they pass the diode test, but the 1N4757 at the positive rail (The beaten side:) has double the resistance, 3.9Mohm at the voltage drop vs 2Mohms of the parallel negetive rail. Reversed it's half the resistance from the other rail 12Mohms vs 24Mohms. Is that significant for the voltage pass to the mosfet?

Hi spritzer, Aplogize for the delay, I've not had the time to do any measuremts until today. I'm getting 366V in the postive rails, 355V on the negetive rails. After some time (a few hours) another 3-4V are added on both rails. Bias is 584V. And i have 300VAC across the primaries on the trnasformer btw, It was commissioned accrding to your specs from sumR. Is there anything else i should check?

^Awesome GIF, one should be warned not to drink while watching it. Actual reason for the bump though is that i'd like to know what could be causing unsatble offset and balance readings with my the KGSS, mainly the left channel keeps bumping up the offset to around 7-8V and the trimmer is already at the end if it's rotation range and is clickin. the balance is 2-3V but i'm able to adjust it easily while the offset is a lot less responsive. Also the readings fluctuate pretty wildly in a scale of 1-2V with me doing anything, No phones connected and no input signal presnt. Is that supposed to behave like this ?

I just meant that would be unrealistic to get on board a flight with such a (sweet) bundle, At least with any security concsious airline company... IME at least. But any other way i'm sure it's great.

Sure, If you travel with Qatar Airways or something...

I apologize if i hurt anyones feelings with my lackluster wording... obviosly i meant what might cause the bias to drop. I took some measurements for what probably is the bias supply part. The resitor i couldn't get a reading from. The Wima cap reads 0V and i suppose that is the problem. it's MKS 4 model rated 0.15uF, 630VDC. It replaced the second TB100n that was damaged when i got the amp. I measure the bias reading at the bias terminal point, It's located after the 4.7M resistor but it did read 580V before IIRC. If it's wrong please tell me where i should measure. @douglasquaid: A, Yeah it's the higest adjustment on the trimmer before it stars clicking. B, Answered above. Thanks for the help and pateince guys.

My KGSS doesn't play nice yet again. Bias voltage has dropped to 235V but the rail voltages all seem to be ok, What does it mean?

I don't have the amp to check the board version currently but that's exactly what happend the second time, the IRF830 actually blew apart to pieces, and the fuze got whacked too. I'll check those T2 parts, thanks. Couldn't be any worse i guess ... heh.

Very cool bringing back them pics sptizer, kodus señor So i own a DIY KGSS (not by myself) and was suggested the 17N80C3 for replacing the N-channel Mosfets at the PS section after previous repeated failings of one the IRF830 that was there...though i'm not techwise i think it's the one who handles the +350V, beacuse it's dropped almost flat. Is it a better fit? I see it's very pricey compared to IRF830, Is there some other decent alternative on a budget?

Hey Don spritzer, Could you maybe upload them again, The lack of pics is a notable drawback in an otherwise very cool tutorial.

Newcomer here, I googled this much appreciated thread in search for a parts list for the KGSS. How come the links in the OP for the PS and AMP boards are directed to the Members list?