Dx Precision, finally released... now debugged and better than HRII

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Do you wanna listen the DHR Turbo?

Here is the chance to evaluate... even beeing photo machine video.... 320 X 240.... awfull wave audio....mono..... into flash player encoding and home reverberations bothering a lot.

Power was around 5 watts RMS of peak instantaneous power...average around 2 watts..

I have increased to 10 watts to see how the Digital camera holds that.... the camera distorted.

http://www.youtube.com/watch?v=GE5EjMSqvMI

regards,

Carlos
 

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My dear friends... this video is important.

not only to make you feel as part of something great (and also crazy), but also to evaluate yourself...to see if you are alike those audiophiles or not.

The youtube has a nice video.... created into a professional mode of movie and video tape programs...nice audio and reasonable video quality.

I suggest you to take a look.

http://www.youtube.com/watch?v=xs1aUws0Lrs&feature=related

regards,

Carlos


An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
Re: Don't worry, about a thing, because every little thing... gonna be all rigth!

destroyer X said:


1) Check transistor for invertions
2) Check if PNP is really into the PNP side (negative side)
3) Check if NPN power units are into the correct side (positive side)
4) Check if you have not inverted the zener diode
5) Check all resistances...measure them, even into the circuit they must show a good reading..normally smaller than the correct value because of circuit resistances..having doubts, dessolder one side and measure with ohmeter.
6) Check each capacitor for correct value, and each electrolitic condenser for value, insulation and polarity
7) Measure your supply and be sure you have the correct positive and correct negative voltage.
8) Check all grounding points..be sure all grounds are joined together.
9) The input ground is to the input shield only...do not connect zobel ground, speaker ground or other into this input lifted ground..only, exclusive to the input cable shield.
10) Print your schematic and search for a red pen or pencil and paint each connection line, check them, each one of them, one by one and paint into the schematic till you have finish to paint all the stuff.
11) Check solder, must be brigth, do not shake soldering iron during soldering... the solder melted may move by itself, do not help and never spit or send breath of air, or air blow into the solder to remove heat...never do that!
12) Check lines for electrical continuity, use a buzzer or ohmeter into the lower resistance scale to check if you have interrupted copper lines.
13) Check each (each) paralell line to see if they touch one each other... clean board with Isopropilic Alcohol, or Kerozene, or Gasoline, or Paint Remover, use a brush and remove all flux (the brown dirty thing)...then observe things with a magnified glass or lenses.
14) If you're using VBE multiplier, check the transistor's position, and check if resistances and potentiomenter are connected correctly.

Carlos

Hiii Papa, how is your daughter ?

A lot of thing to check carlos make a simple DX
if you have another time or this is the price for
P R E C I S I O N

😀

Regards, Jeffry
 
Have to check when we make mistake into the construction

If no mistake.... then no need to check things.

The check up list is to help folks to debug

I hope you are doing fine dear Jeffry.

...well...about my daugthers i am a veru lucky man... they are all beautifull inside their heart.... to my eyes (heart) they are beautifull.

This one is not exactly my daugther.... she is my wife's daugther from her first husband.... but i am with her those last 18 years...so....she is my daugther too.

Carlos

http://img174.imageshack.us/img174/6214/imagem085vw2.jpg
 
Re: My dear friends... this video is important.

destroyer X said:

not only to make you feel as part of something great (and also crazy), but also to evaluate yourself...to see if you are alike those audiophiles or not.

The youtube has a nice video.... created into a professional mode of movie and video tape programs...nice audio and reasonable video quality.

I suggest you to take a look.

http://www.youtube.com/watch?v=xs1aUws0Lrs&feature=related

regards,

Carlos




An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.


Uncle Carlos
You are kidding of course. I am registered in this club (ACA) but from circumstance. I have posted one or two posts in this forum. The members of this club are very polite and educated persons without doubth. But they are living in their world, far from our world (if we take into account your speaker in your photo 😀 😀 😀 and my little mission780 speakers with the 10 times repaired woofers).
It is a kind of fetishism such as our crazy for doing everything by our hands.

Fotios
 
Carlos --- absolutely brilliant link. Thank you 🙂 🙂
I can relate to them -- listening to music in a semi hypnotic state, of being there, and you know what. You don't need spend 60.000 euros to do it. Synergy -- it was all mentioned -- it's true, some systems have that magic ability, they sound much much better than you would ever believe possible. It can all come together, that feeling of being there. Thank you 🙂
 
You certainly don't have to go to those extremes and dollars. 😱

In fact the system I enjoy the most is also the cheapest I have. Sure, I can pick faults very easily with it but it's just musical and enjoyable.... just makes music.... isn't that what is important.

I don't use the main system very much which has the higher dollar components. The reason being after a while I tend to slip into listening to the gear more than the music which is a shame as it is extremely good. 🙁 I'm working on changing that with some component changes and tweaks to make it less "high end" (hate that term) and more "normal" (enjoyable). Too much of a good thing can backfire and remove some listening enjoyment.
 
Well dear Rabbitz.... i have to agree... some condensers really sounds special

I had not that belief....i was thinking people was deliranting.

But those green ones you have sent me seems to sound better..... maybe i am fooling myself.... but as a result, fooling or not fooling myself, i am perceiving (maybe making my own mind) something better.

I was in doubt..... could not believe.... this is bill shut in my point of view ... "condensers are condensers and not more than condensers"...they have inductance, capacitance, reactance! and nice colours into the plastic.... different plastic cover, size and different people that loves them...the yellow stripped, the golden things....bill shut was my perception TILL THOSE LAST TWO DAYS.

I have to say...I WAS WRONG!.... i have tried your bipolar special 47uf into my speaker midrange..... the sound came alive.... i said to myself...

- "Foolish!".... you just like Peter...just that... foolish!..... them i removed to test them out... the one i was using had 52uf.... your unit 50uf (the 47uf one)... this is normal... they are the same in value....but the green one sounds better.... then i have installed a switch..... could not believe!...had to switch one and the other..... clear difference!

Sorry..... living and learning... each day more things to learn... this is lovely...but i am hardly ashamed Peter..... i was always against those things; the unobtanium things.... powder of inexistium, sub extract of illusions...but this one resulted better.

But i could not accept that for too long...then i realized the one i was using could be a bad one.... them a replaced with another to compare with the green one...once again the green one was the winner.

And then i have replaced the green one with another new unit.... better once again...but not exactly so loud...maybe because new... first time biased...first time working.

I felt very sad i had told lies to folks.. saying condensers sounds the same..... well... this green one does sound better...for sure it sounds better than the others i have...the ones are common, standard, the normal ones.

regards,

Carlos


..................................................................................................

Sinergy..... yes Mooly.... for sure we can..... but the turntable alike a Gym machine was lovely..ahahahaha.... lovely monster.

But people are crazy too.... mains must be 230 VAC stable... and this is 50 percent of the sound?...ahahahah... a little bit crazy those things.

regards,

Carlos

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
Carlos

Where exactly are you using that green cap....speaker crossover?

As I've said before, I know nothing about amp design and electronics but have had nice results using capacitors from the Nichicon Muse series. I'm only a tweaker and have tried little of other brands. Have played a little with Blackgate, Jamicon, Hitano, Elna Cerafine, Panasonic Fc but I found the Nichicons gave good consistent results at a reasonable price.

Green (BP) Nichicon ES - used in opamp power supplies at the opamp as well as signal caps on CD output and amp input. Blackgate N (red) are better IMO but very expensive and getting harder to find.

Gold with black stripe Nichicon FG - used in opamp power supplies and amp power supplies on the amplifier PCB.

Black with gold stripe Nichicon KZ - used in amplifier power supplies on the amplifier PCB and for bootstrap cap. I liked it as a bootstrap much better than the Blackgate Standard which takes forever to burn in.
 
Caps measured the same as the ones you replaced?

Why I ask is the caps can vary a bit from the value and I think these are ±20% which could effect the speaker crossover and change the crossover point. If both caps were the same value then the sound differences would be due to the cap only.

OK... I just read again and you already said 52uF for the original and 50uF for the new so very little difference.

So your amp and speakers are turning green. 😉
 
Ahahahaha.... this gonna be too much to me

ahahaha!

Will let you try this.

In advance i will try other things... alike the AC voltage stabilizer to keep my audio syncronized with the universe..ahahahaha.

Maybe, instead of that, and in advance, i will try the magic cristal we could see into the Athens Audiophile club, to see if i turn lucky and after wake up into the next day, my old car would be transformed into a Lamborghini Diablo.

Sorry, it is too much to me to be waiting for those results...one month latter or to be waiting something to burn....my patience will burn instead of those capacitors.

Follow the adress bellow and take a look into the video.... the lucky magic cristal.

regards

Carlos
 

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It is not so funny uncle Carlos

This club ACA is located in Athens, the capital of Greece as you know. In the region of Athens they live the half of population of Greece i.e. around 5 million people (included Sakis 😀 😀 😀 Ahahahahahaha ).
Because the worldwide crisis of energy, the public corporation of electricity in Greece two years ago, it has reduced the mains voltage level in other regions of Greece, so as it remains at 230VAC in Athens.
The result is this, in the town where i am living in north Greece the voltage has reduced in 215 to 220VAC the last 2 years. Especially during weekends it plays between 214-218VAC. And my amplifier performance degraded especially when my mother starts cooking and the voltage drops in 210VAC.
😀 😀 😀 😀
 
Mine variates too....nominal is 220 VAC, but goes up and down a little

Around 5 percent.

Interesting this degradation (lowering of, losses, reduction) of quality... very interesting.

I hope degradation is the correct written name.

Maybe Sakis amplifier is sucking too much energy from the mains.

Relax fótios..will send you the magic cristal to capture universe energies to your mains.

Build a Dx Amplifier... sound will be the same when you have mains variation of 25 percent plus and 25 percent minus....big magic without cristal.

- " Dx Amplifiers have immunity to Athens mains variation...build a Dx Amplifier and do not worry with Greece mains problems anymore " (**)

(**) Dx Corporation Marketing Department Advertising phrase number
067-76 SS - Greece

I cannot stop to watch this video about Greek Audiophiles.... they are not different from other places.... so crazy as i am.

ahahahaha!

Carlos
 

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