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Old 25th November 2009, 11:43 PM   #11
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also you recomend inputing the signal right before caps 7 and 57 right?..i may try that.sounds good!..i will also try to change these two caps with much better quality ones as i have some spares.
My friends do you know any online store selling good quality parts as good quality caps,resistors etc?..
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Old 25th November 2009, 11:53 PM   #12
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With the transformer you already have , you can make an unregulated PSU with ONE bridge and 2 or 4 electrolytics and power the preamp by now ...then for comparison you'll build the regulated one !
If you're thinking in upgrading the caps ,so why not the transistors etc...

Last edited by picowallspeaker; 25th November 2009 at 11:56 PM.
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Old 25th November 2009, 11:56 PM   #13
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well if i want to bypass the first rec out part of the preamp i must put the rca's there am i right?..hmm..if by saturday i dont have the normal transformer then i will do try what you said!
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Old 3rd December 2009, 09:12 PM   #14
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one more question.i am looking to buy an ALPS 100K lineal stereo potentiometer but i dont seem to find one easily in Greece..May i use a Logarithmic or it wont work ok? the easiest to find is a 50K log...Can i use this with this pre amp design?
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Old 4th December 2009, 07:32 AM   #15
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dear sifis ....we meet ...again ...

fanos in athens can supply you with alps pots 210-3828.748.if they dont have the specific model they will get it for you .....

spare a moment and listen to a couple of things please ....

there is a few things that are related to reference .... meaning that you may not learn to listen from a very good preamplifier

what i am trying to say is that you need to create a reference before everything else reference is created strictly by one cd ( not a source juast a disc ) of your favourite music , one cd player of any quality , one amplifier of any quality , and a pair of speakers of your choise ....

After that the only thing you nedd is to listen to this cd a gozillion of times if possible you nedd to know every litle small detail , every lilte small fragment of music , every lyric , every vocal ....in a few words everything .....

After that you will realize that any preamplifier and specificly this smart will sound much worst than a simple potentiometer between your cd player and your amplifier ....

to create a reference you dont need to have state of the art equipment ....you simply need to evaluate what you allready have .....then after that and alwayw with knowledge of what you listen you will be able to evaluate a new added preamp in the system , another pair of speakers , anther amp and goes on ....

if you expect to learn from smartkit products εισαι μακρυα νυχτωμενος φιλε μου ....

excuse my greek and my tone which as most forum memebrs know is mostly on the fun side no hard feelings for anyone


( nothing against smart kit products also ...old designs , working , but designs are made versus cost and material inside is most of the time cheapest available )
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Old 4th December 2009, 08:53 AM   #16
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ah my friend i TOTALY understand you trust me. My problem is lack of knowledge and lack of time to study and read.Also i am so stressed in my life that even when i try to learn something new i just find it too hard...the reason i am building this preamp is just to know that i builted it and also in order to be able to test some prof final amps that i try to repair with my poor kowledge.Cheap professional amps that some people gave it to me for free and i try to repair.. i just want to build something that at least in theory is as good as i can build. currently i am listening to a T-amp using the Tripath 2020 EVERYDAY all the day. firstly using a switching supply,afterwards i builted a 12v 100va supply and i saw great difference..my quest is continouing as days passby...next step is to use in the same setup the Gainclone i try to finish weeks now, gainclone was bought from Audiosector... The preamp is going to be used for testing reasons.. to see if it sounds better or not etc...by the way my reference is some selections of songs of Giannis Kotsiras, Xatzis and Manu Chao...thats why i loooove warm-alive vocals...thanks for the advice my friend!i accept every advice...
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Old 10th December 2009, 02:27 PM   #17
Glowbug is offline Glowbug  United States
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Quote:
After that you will realize that any preamplifier and specificly this smart will sound much worst than a simple potentiometer between your cd player and your amplifier ....
Well, assuming the rest of the system is compatible for that

Which is where things like the Pass B1 come into play...
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Old 21st December 2009, 06:16 PM   #18
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Hi, If you want to try an alternative opamp a OPA134 would probably be suitable. It doesn't require the compensation capacitor from pin 8 to pin 5. But since pin 5 is not connected in a OPA134 it will not cause a problem if you leave it in.

It appears that the opamps in this design are biased into class A operation by a current mirror on the output. This may lead to the opamp running hot and you should check this if you change to a OPA134 as its characteristics will be different to a NE5534.

Having a buffer before the volume pot can sound better in some systems depending on the output impedance of your source so don't assume that bypassing the first stage will definately sound better.

Regards,
Andrew
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Old 21st December 2009, 07:54 PM   #19
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I will try your advices guys... I also decided to integeate a dac in the preamp giving to my pream much more connection possibilities! I ll have a look in ebay.. I want both optical- spdif and usb connection.... I ve seen some interesting dacs... That what makes me sad is that i havent received my box yet to put the pre amp in...
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Old 21st December 2009, 10:54 PM   #20
gfiandy is offline gfiandy  United Kingdom
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Hi, I recomend working on one thing at a time. Get your preamp working first then move onto the DAC. Too many problems at once and it can be very difficult to track down what is going on.

Regards,
Andrew
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