I will make a distortion graph of my KSA-50 this weekend but I can definately say that mine doesn't sound like what you describe. Perhaps the use of newer generation of semi's has helped. Other people who have spent time listening to it generally agree that its not at all what they were expecting it to sound like. The .008% that I measured a couple of months ago is pretty close to the original anyway. I sometimes prefer to tweek the bias while on the analyzer but have not yet since I have been delighted with how the amp sounds.
Mark
Mark
Steen, remember, that clear high make mainly sophisticated connection and precise designed construction, not miracle caps 😉 .
You are right Upopa😀 (as always🙂 ) I wasn't sure about it, thats why I guessed😉 The Zap is precisly designed, IMHO. No NFB!
And the Sanken output transistors has something to say too😉
Nonetheless, that amp sounds incredibly good🙂
Steen😎
As Peter and Steen mentioned Zapsolutes I took a dive to their site.
Looking at their construction manual (pdf) it call my attention the DC filter it uses, page 10, here are two lytics plus two other black components i did not recognized.
Might be a good circuit to take in consideration when building this Krell or other amp.
Could someone shed some light as how this circuit works?
http://www.lightball.dk/download/com/pdf/mk4build.pdf
Looking at their construction manual (pdf) it call my attention the DC filter it uses, page 10, here are two lytics plus two other black components i did not recognized.
Might be a good circuit to take in consideration when building this Krell or other amp.
Could someone shed some light as how this circuit works?
http://www.lightball.dk/download/com/pdf/mk4build.pdf
Just for general info, I'm not around much at the mo, as I can only log on at work. I'm having ISP issues at home, (i.e. I forgot to pay the bill!) 🙂
Apassgear, here you go! Just go down the side a bit!
http://www.lcaudio.com/index.php?page=12
Hope the URL works🙂 That would be a nice thing to do for us DIY'ers🙂 Or you could just order it from Lars, like I did. Its cheap enough😉 I also ordered 2 softstart circuits, for my Aleph-X 100 watt's monoblocks. This is not meant as advertising, whatsoever!
Just some good advice😀 That guy rock's, if you ask me😉 (I mean Lars, LCaudio)
Steen😎
The circuit filters out the DC on the AC mains supply, which is what make's your trafo's go hummmm.
http://www.lcaudio.com/index.php?page=12
Hope the URL works🙂 That would be a nice thing to do for us DIY'ers🙂 Or you could just order it from Lars, like I did. Its cheap enough😉 I also ordered 2 softstart circuits, for my Aleph-X 100 watt's monoblocks. This is not meant as advertising, whatsoever!
Just some good advice😀 That guy rock's, if you ask me😉 (I mean Lars, LCaudio)
Steen😎
The circuit filters out the DC on the AC mains supply, which is what make's your trafo's go hummmm.
power supplies...
If I am looking at the same components you are there are dale resistors...
Looking at the layout I think they have a crcrcrcrc type filter, my guess is it's probably better at filtering the high frequency, high current spikes the amp generates as it switches, but it's not necessarily the right answer for an amp that has mostly constant current demands...
For krell ksa50 'ripple' removal purposes a straight C filter works quite well (50-100mv ripple). A CRC works better (20-50mv) but has noticeable losses if the R is large enough to do a good job, and CLC is best of all (2-20mv), so good in fact that you really have to make a big investment in a high quality regulated supply to noticeably improve on it...I was using 68000 caps for testing, obviously your figures will be different depending on all the obvious factors...It was not clear to me that any of these configurations sounded 'better' than the others, but at that time I didn't devote much effort to listening...
If you are interested in playing, check out duncans PSU designer, it allows the various configurations to be explored with a high degree of accuracy, I found the simulation to be as close to 'reality' as typical component tolerances...
Stuart
If I am looking at the same components you are there are dale resistors...
Looking at the layout I think they have a crcrcrcrc type filter, my guess is it's probably better at filtering the high frequency, high current spikes the amp generates as it switches, but it's not necessarily the right answer for an amp that has mostly constant current demands...
For krell ksa50 'ripple' removal purposes a straight C filter works quite well (50-100mv ripple). A CRC works better (20-50mv) but has noticeable losses if the R is large enough to do a good job, and CLC is best of all (2-20mv), so good in fact that you really have to make a big investment in a high quality regulated supply to noticeably improve on it...I was using 68000 caps for testing, obviously your figures will be different depending on all the obvious factors...It was not clear to me that any of these configurations sounded 'better' than the others, but at that time I didn't devote much effort to listening...
If you are interested in playing, check out duncans PSU designer, it allows the various configurations to be explored with a high degree of accuracy, I found the simulation to be as close to 'reality' as typical component tolerances...
Stuart
I dont think thats what Apassgear, asked about. But correct me if I am wrong. Lars also has a certain way to charge the E-lyts in the PSU, by the way of the Dale's resistors. There was a major discussion on this forum on that subject. Search for "current wobling" or something like that. Lars's theory with this is that the caps in the PSU charges evenly over time, if I got it right
Steen.🙂
the QUICK description is electrolytic caps with paralleled rectifiers to block DC in the power transformer, preventing humming caused by DC saturation.
do a search for (i think) "DC filters" for A LOT of discussion, tests and testimonials of the approach.
mlloyd1
do a search for (i think) "DC filters" for A LOT of discussion, tests and testimonials of the approach.
mlloyd1
apassgear said:
Thanks Steen, so those black components are power zeners.
Mlloyd, If you look to the page that Steen pointed you will see they are 4.3V zeners if I read correctly.
Mlloyd, If you look to the page that Steen pointed you will see they are 4.3V zeners if I read correctly.
That's funny, I'm using the Hypex UcD180 on the woofers and the KSA-50 on the mid/treble...
Should I switch them around? 😉 I think not. But I might try flipping them just for kicks.
Should I switch them around? 😉 I think not. But I might try flipping them just for kicks.
If that's what the Tranzorber's are, thanks. I have been wondering about that particular component! I have to admit, that my Zapsolute still has a bit of hummm from the trafo's!
Even with those circuits in
Steen🙂
Ok, I did dig up the story on "current woppling" as it were.
Make your own decision on that one😀
Steen.🙂
http://www.diyaudio.com/forums/showthread.php?s=&threadid=26045&highlight=
It all sounds pretty good to me, I have his amp😉 As I said it sounds just great🙂
Make your own decision on that one😀
Steen.🙂
http://www.diyaudio.com/forums/showthread.php?s=&threadid=26045&highlight=
It all sounds pretty good to me, I have his amp😉 As I said it sounds just great🙂
Keep the cheese, keep the Hypex.
I thought this was a class A thread, even the Mouse is splitting.
Give me Krell boards, and quick, before you are all going D !
Anyone considered a DC-servo on the Krell instead of blocking it with a couple of big caps ?
I thought this was a class A thread, even the Mouse is splitting.
Give me Krell boards, and quick, before you are all going D !
Anyone considered a DC-servo on the Krell instead of blocking it with a couple of big caps ?
hmmm, maybe i'm not looking at the same photo.
this is what i see on page 10 of the pdf:
i see a big electrolytic cap, a space for another, and what looks to me like two bridge rectifiers. I also see some heavy leads that look to come from the main power transformer. i assume they are primary leads to wire the DC filter in series as per the reference i mentioned in my earlier post.
hey, I'm almost 50. probably going blind now, too.
🙂
mlloyd1
this is what i see on page 10 of the pdf:
i see a big electrolytic cap, a space for another, and what looks to me like two bridge rectifiers. I also see some heavy leads that look to come from the main power transformer. i assume they are primary leads to wire the DC filter in series as per the reference i mentioned in my earlier post.
hey, I'm almost 50. probably going blind now, too.
🙂
mlloyd1
apassgear said:
Attachments
Hi,
I am thinking, but only thinking at this time, about small plug-in boards for VI limiting, DC servo, CCS on LTP, current protection on VAS.
Current thoughts are if they don't work then easy to revert to original.
Has anyone looked at Bensen's spreadsheet on output stage SOAR into reactive loads?
I tried it on driver SOAR and discovered why some designs use output BJTs as drivers!!
I am thinking, but only thinking at this time, about small plug-in boards for VI limiting, DC servo, CCS on LTP, current protection on VAS.
Current thoughts are if they don't work then easy to revert to original.
Has anyone looked at Bensen's spreadsheet on output stage SOAR into reactive loads?
I tried it on driver SOAR and discovered why some designs use output BJTs as drivers!!
Ok I know you dutchmen love cheese😀 I love your Gouda too🙂
Steen😎
Mloyd1 Take a look at post 2487! Wow thats a lot of posts😀
Yep, but those circuits are of particular interest for Class A ppl. Otherwise I would not have brought it to your attention. I am sure that the DC filter and the softstart, will come in handy for a big Krell too😱
Steen😎
Mloyd1 Take a look at post 2487! Wow thats a lot of posts😀
Gouda is Dutch, Hypex is Dutch.
I dont like cheese and i am building a Krell, send me some smorebrod !
With 12 Sanken 2922/1216, not 2 as LC does, and i do not fully agree with LC's view on parallelling output devices.
You think a constant current source on the LTP would be more favorable than just giving the LTP and VAS a separate PS, Andrew ?
I dont like cheese and i am building a Krell, send me some smorebrod !
With 12 Sanken 2922/1216, not 2 as LC does, and i do not fully agree with LC's view on parallelling output devices.
You think a constant current source on the LTP would be more favorable than just giving the LTP and VAS a separate PS, Andrew ?
