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Old 19th September 2011, 10:51 AM   #17451
RCruz is offline RCruz  Switzerland
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Originally Posted by Ben Hanke View Post
This went very smoothly, except the disc keeps spinning slowly after the player has stopped now for some reason... I've invented perpetual motion! It's amazing what these players can do :-b
Did you increase the caps values after the main 5v reg in your cdp ?
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Old 19th September 2011, 10:58 AM   #17452
Thomo is offline Thomo  United Kingdom
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Originally Posted by Fidelity Audio View Post
My dos is still running in. Up to now it is not has linear or as analogue as my previous board. More bass weight has come out of it over the last 24 hours but am finding piano to be a bit shrill.
Brent
I agree with that lot. Heard the player before the new output, with CCS and then again after the CCS removal.

With CCS it was shrill and harsh seeming to falsely emphasise certain frequency bands and giving a false impression of better dynamics to leading edges of instruments. It simply didn't sound correct.

After the CCS removed it was back to its old self. Incredibly rich, neutral and correct.

Lee.
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Old 19th September 2011, 11:52 AM   #17453
RCruz is offline RCruz  Switzerland
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Hi Brent
I also experienced similar results when I used a CCS under my buffer jfet. A resistor sounds more even.
What type of resistor do you use instead of the CCS ?
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Old 19th September 2011, 12:05 PM   #17454
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Hi Ricardo

I just placed the Welwyn RC55Y 0.1% metal film 1K8 from my older dos pcb.

I am fully happy with the sound now, I have her back and singing like she normally does. More dynamic, cleaner with greater detail in the bass and treble.

The CCS made the sound very narrow band for me with peaks at certain frequency points. CFP seems pretty much the same to be honest, maybe a slight improvement in mid band clarity + a small amount of dynamic gain.

Brent

Last edited by Fidelity Audio; 19th September 2011 at 12:12 PM.
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Old 19th September 2011, 12:18 PM   #17455
RCruz is offline RCruz  Switzerland
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Thank you Brent

So there is improvement relative to the old DOS, even if slight
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Old 19th September 2011, 12:34 PM   #17456
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For me it is very slight, dynamics on well recorded music have improved and a slight mid band clarity lift. But any improvement is always welcomed.

The biggest thing for me is the fact I can fit the SPowers direct into the pcb now rather than tagging them on. The pcb is very well made and track layout is also better than the original pcbs.

I hope Ian tries the DOS with CCS and without to see what he finds

Brent
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Old 19th September 2011, 12:59 PM   #17457
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Originally Posted by UV101 View Post
How many did you order? It's something i'd like to do. Any additional info would be much appreciated ;-)
Go to Texas Components - Precision Resistor & Microelectronics for all the information you like. You simply decide what you would like and then email and ask them how much it will be.
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Old 19th September 2011, 01:31 PM   #17458
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Originally Posted by Fidelity Audio View Post
For me it is very slight, dynamics on well recorded music have improved and a slight mid band clarity lift. But any improvement is always welcomed.

The biggest thing for me is the fact I can fit the SPowers direct into the pcb now rather than tagging them on. The pcb is very well made and track layout is also better than the original pcbs.

I hope Ian tries the DOS with CCS and without to see what he finds

Brent
HI Brent,
I have found it interesting to read your comments regarding your new Dos, especially as they are a little bit at odds with my own experiences. The compound transistors as used in the design are a far superior circuit to the standard long tailed pair as the they stabilize the large voltage swings between +1.6v to -1.6v. How you hear the results of this is something else. And what I read in your notes is: the old sound is the long term reference to me and the new sound is different and I'm not sure I like it as much. But to make a true comparison one needs 2 players with Dos's, differing only in the addition of the compound pair. This may be hard to do, for obvious reasons. Even I, with several players and boards, did not do this. However, I did hear immediate improvement, in terms of musical clarity and definition, from the get go, and once I got the proper resistor between the pair I found a huge improvement in the bass, and there was nothing subtle about this last observation. And I admit to some surprise that you are not hearing the same. But then again, different player, different system, etc.

I have also used a compound pair to great success in the input stage of one of my preamps, going from a standard design ltp to a perfectly simulated cfp design, and again the difference was not subtle. In this application there really was not much voltage swing to stabilize, and my designer friend (not Ray btw) didn't think it would really do much. But upon hearing the results, agreed with me that it was a nice improvement.

Give your new DOS some time.

Steve
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Old 19th September 2011, 01:44 PM   #17459
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Hi Steve

I really don't know what to say other than what I have heard. 7 days of constant running in was enough for me and from my experience of upgrading etc I know it was simply not a matter of the new resistors etc running in. I tried a few fets and ran at different mA but never once had a linear sound. There were upper mid peaks and yes a tighter bass but on my player and revealing system it was false. My players does bass like pretty much no other, a dcs dac perhaps had similar results, deep and tight. Midrange and top end detail is sublime. The old dos let this all through.

Ricardo has too found a similar issue with CCS. Lee came over and heard it too and he is very familiar with my player and system.

Brent

Last edited by Fidelity Audio; 19th September 2011 at 01:47 PM.
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Old 19th September 2011, 01:55 PM   #17460
SimontY is offline SimontY  United Kingdom
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I'll second that the midrange and top end clarity are sublime on that setup, can't say for the CCS version though as I didn't hear it lol
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