luvdunhill Posted May 16, 2016 Report Share Posted May 16, 2016 I definitely have some ... Some where. Quote Link to comment Share on other sites More sharing options...
jose Posted May 17, 2016 Report Share Posted May 17, 2016 My progress I ordered a toroid with 360X2 @350mA but I don´t know what I can do. With this trafo, a 400 vol output is a overkill? I would like use a 20mA configuration on amp. Quote Link to comment Share on other sites More sharing options...
mwl168 Posted May 17, 2016 Author Report Share Posted May 17, 2016 (edited) Nice work Jose. IIRC, the dropout voltage on this regulator is about 9 VDC for my 400 VDC setup. With a 360vac secondaries you should be able to get reliable 450 VDC regulated output without issue accounting for mains fluctuation. I believe Kerry has a related post on this matter here in this thread. Edited May 17, 2016 by mwl168 Quote Link to comment Share on other sites More sharing options...
jose Posted May 18, 2016 Report Share Posted May 18, 2016 Thanks mwl168. I was wrong because I saw the pcb layout and ordered a 360 Volt trafo for 400VDC Well If I use 450 VDC PSU (All I need is change four resistors on de the PSU and it's easy), Need I change something on amp boards? Quote Link to comment Share on other sites More sharing options...
GeorgeP Posted May 18, 2016 Report Share Posted May 18, 2016 just the resistors on the psu Quote Link to comment Share on other sites More sharing options...
mwl168 Posted May 18, 2016 Author Report Share Posted May 18, 2016 (edited) 45 minutes ago, jose said: Thanks mwl168. I was wrong because I saw the pcb layout and ordered a 360 Volt trafo for 400VDC Well If I use 450 VDC PSU (All I need is change four resistors on de the PSU and it's easy), Need I change something on amp boards? I cannot tell for sure from the photos you posted but make sure your pre and post regulation filter caps are up to spec. Looks like they are all 550VDC rated? I took a quick look at the Carbon amp board and I cannot think of anything you need to change going from 400 VDC rails to 450 VDC. Others might chime in if they spot someting. By the way, on my setup, I can barely feel a temperature on the PSU heatsinks after hours of running my Carbon with 20mA output setting (I think my trafo has 330 vac secondaries). The amp heatsinks are a different story, they run VERY HOT, much more so than the KGSSHV. That's another thing to keep an eye on. Edited May 18, 2016 by mwl168 Quote Link to comment Share on other sites More sharing options...
jose Posted May 18, 2016 Report Share Posted May 18, 2016 21 minutes ago, mwl168 said: I cannot tell for sure from the photos you posted but make sure your pre and post regulation filter caps are up to spec. Looks like they are all 550VDC rated? I took a quick look at the Carbon amp board and I cannot think of anything you need to change going from 400 VDC rails to 450 VDC. Others might chime in if they spot someting. By the way, on my setup, I can barely feel a temperature on the PSU heatsinks after hours of running my Carbon with 20mA output setting (I think my trafo has 330 vac secondaries). The amp heatsinks are a different story, they run VERY HOT, much more so than the KGSSHV. That's another thing to keep an eye on. Thanks. Yes, all caps are 680uF/550VDC. Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted May 21, 2016 Report Share Posted May 21, 2016 Well done jose. I was going to post these images in the builds thread but it’s missing in action. Thanks to Kevin and Birgir for being awesome. Thanks to Michael (mw168) for all the work you’ve put in with the group buys and documenting etc it’s been very helpful. A couple KGSSHV Carbon amps running 400V @ 20ma, GRLV supplies, SUMR transformers. 13 Quote Link to comment Share on other sites More sharing options...
kingofsnake Posted May 21, 2016 Report Share Posted May 21, 2016 What a lovely build you have there, and so very compact too. Those offset trimpot adjusters look interestingly positioned. Quote Link to comment Share on other sites More sharing options...
G600 Posted May 21, 2016 Report Share Posted May 21, 2016 Another professional-looking-premium build. State of the art ! Quote Link to comment Share on other sites More sharing options...
UFN Posted May 21, 2016 Report Share Posted May 21, 2016 Superb! //UFN Quote Link to comment Share on other sites More sharing options...
Kerry Posted May 21, 2016 Report Share Posted May 21, 2016 Congrats! Those look awesome. Quote Link to comment Share on other sites More sharing options...
wink Posted May 21, 2016 Report Share Posted May 21, 2016 Which one's mine....? Quote Link to comment Share on other sites More sharing options...
mwl168 Posted May 21, 2016 Author Report Share Posted May 21, 2016 Awesome! Quote Link to comment Share on other sites More sharing options...
HemiSam Posted May 21, 2016 Report Share Posted May 21, 2016 You outdid yourself, John....congratulations! HS Quote Link to comment Share on other sites More sharing options...
chinsettawong Posted May 21, 2016 Report Share Posted May 21, 2016 Beautiful! Quote Link to comment Share on other sites More sharing options...
Laowei Posted May 21, 2016 Report Share Posted May 21, 2016 Well done Sir! How do they sound? Quote Link to comment Share on other sites More sharing options...
nopants Posted May 21, 2016 Report Share Posted May 21, 2016 nice, curious as to how it sounds over the t2 Quote Link to comment Share on other sites More sharing options...
headinclouds Posted May 21, 2016 Report Share Posted May 21, 2016 Well done John! Nicely arranged and executed Quote Link to comment Share on other sites More sharing options...
JimL Posted May 21, 2016 Report Share Posted May 21, 2016 Spectaular! Quote Link to comment Share on other sites More sharing options...
JK47 Posted May 21, 2016 Report Share Posted May 21, 2016 That's gorgeous... Sledgehammer!!! Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted May 21, 2016 Report Share Posted May 21, 2016 Thanks guys! As to the sound, I’ve had a fairly good listen now, I can confidently say It’s a good improvement in performance from the KGSSHV’s and BHSE I have on hand. I’ve always maintained the BHSE and KGSSHV were a similar calibre, with different signatures depending on your taste and music genre. Interestingly I find myself in the same scenario with the Carbon and the T2, I don’t prefer one over the other, both have slight contrasting differences. To be crude and simplistic, the Carbon has transparency and the T2 sweetness and tone, but both amps do everything exceptionally well. The Carbon is unquestionably the most stable amp in my arsenal, do we need servos on the next board runs? 3 Quote Link to comment Share on other sites More sharing options...
JoaMat Posted May 22, 2016 Report Share Posted May 22, 2016 Have you tried the opto servo? Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted May 22, 2016 Report Share Posted May 22, 2016 The highest reading I‘ve had on start up is around 15V and this quickly settles, I will try the servos at some stage to see if how they perform. Quote Link to comment Share on other sites More sharing options...
GeorgeP Posted May 22, 2016 Report Share Posted May 22, 2016 Yeah, the servos really aren't needed from my experience as well - it is super stable from the get go and settles very quickly. 1 Quote Link to comment Share on other sites More sharing options...
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