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Old 19th April 2003, 02:29 AM   #11
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Default Distorsion

Hi Guido. I change tube and now I got the same value as you, about 0.3%. No I cannot differenciate the harmonics. I'm using a HP 334 Distorsion analyser. Yes, I agree, some line freq. harmonics may well be present and contribute to the total harmonic content.

My tube is a Svotek 6922. Any better tube for the job?
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Old 19th April 2003, 02:33 AM   #12
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Default Prototype almost ready

Here a picture of the complete prototype almost ready to listen to. I'm missing a 74HC393 IC.
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File Type: jpg proto_small.jpg (97.2 KB, 4089 views)
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Old 22nd April 2003, 02:28 AM   #13
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Default The completed DAC is working

I did it. I connected everything and it works immediatly. Thanks Guido and all your team.

My setup:
Amp: My DIY Aleph30
Preamp: Simaudio i-5, preamp section only
Speaker: Axiom 3Ti mini monitors
CD: Copland 277
I connected the DAC to cd input and the normal audio output of the Copland to A1 on the preamp. So I was able to switch rapidly between both to compare

The first listening impressions:
First of all, the DAC sound as good as the audio output of my Copland. Then after listening to the DAC I realized that the DAC sounds more relaxed, the highs were smoother, the bass naybe more firm. In general the DAC sounds more easy than the Copland. On the original Copland sound, the high were slightly aggresives compare to the DAC.

I like the way the DAC sound verymuch and it is a first impression. The DAC big Jensen All copper caps are not yet broke in.

I let everything running for break in using the Stereophile Test CD1 burning track 20. I will comment again in a few days to see if the sound improved.

Sound very promessing
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Old 23rd April 2003, 12:00 AM   #14
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Default More listening

Incredible. I just bought the 30th anniversary version of Pink Floyd Dark Side of the Moon, I know, I know but I'm forty so...

It is the first time that I realize that the heart beat at the beginning is really from a drum. I hear it clearly. Stereo image and micro details are incredibles. The sound is so soft. No more CD agressive sound.

I have to go back to it. Bye...

SB
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Old 23rd April 2003, 12:22 AM   #15
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Default CONGRATS.

Hi,

Quote:
My tube is a Svotek 6922. Any better tube for the job?
How deep are your pockets?

1/ E288CC/8223?
2/ E188CC/7308
3/ Cca...almost unobtainable
4/ E88CC/6922 European top brand
5/ Handpicked ECC88s: TFK,Philips and licensees,etc.
6/Sovteks 6922s are good though, leave them in for a few weeks to burn in and I doubt you'd want to spend megabucks on others.
7/USSR 6N1P provided the heater windings are up to it.

L'embarras du choix,
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Old 23rd April 2003, 11:30 AM   #16
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Default Better tube

I may try the Svetlana 6N1P. I want to test my transfo tonight to check the current supply of the filament. I requested 6.3V, 0.7A min. so I should be OK.

Thanks for the suggestions.

SB
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Old 25th April 2003, 02:13 AM   #17
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Default I got enough current, I got the 6N1P

I got plenty of current from my tranfo. I can supply up to 1.2A so I can easily supply the 650ma needed bu the 6N1P filament. I place an other for the tubes tomorrow...
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Old 27th April 2003, 03:25 PM   #18
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Default So good you need a good Amp

My Dac sound so good that I started to play with the rest of the system to get the best of it. I'm using my trusty Aleph30 and just experimented with new speaker cable. SO the result at:

http://www.diyaudio.com/forums/showt...325#post167325
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Old 27th April 2003, 03:53 PM   #19
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I tend to like this CAT5 cable recipie better.

http://www.venhaus1.com/diycatfivecables.html


It uses Belden teflon CAT5 cable, and has gotten many good reviews. I personally like the look of the outer jacket stripped off too. SOOO much more work involved though. Something like 5 hours to braid all the individual pairs.

-Maz
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Old 27th April 2003, 09:28 PM   #20
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Default VENHAUS.

Hi,

Quote:
I tend to like this CAT5 cable recipie better.
Cheap and cheerful and fine sounding stuff too.

Cheers,
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