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Old 29th October 2012, 03:20 AM   #71
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Default My people, in my country , are building...we already have 8 units playing, all made

yesterday....they said was alike alike a contact with the divine..they have almost felt from the chair they have sitted when listened first time after transforming their previous built Dx Blame ST and Dx Supercharged into Dx Super A.

They said the sound was totaly different, much more clear alike you perceive if someone remove a pillow that was covering the speaker grille.

O felt the same surprise... i do not believe in simulators..... i do use them because people believe...and if they believe will understand my amplifiers are good..and this will drive them to build...and this is what i love to see them doing..but i really do not believe too much related what simulator says (calculation says)....i was very surprised too...also how low is 1 watt in pure class A... a big surprise when comparing one to the other....you see that Nelson Pass is right...he is not crazy as i though first time i saw his monsters (big, huge units with a couple of watts)

I have assembled several units in Class A.... in special the JLH...but the trouble was the lack of comparison, it is hard to perceive differences after you tweak something...without comparison we cannot perceive because our ear/brain adjust everything in a matter of one or two seconds...so.... you start to listen bass from these small speakers in cell phones when there's no bass there...you brain (memory, audio experience) fill the gaps and complete the "whole scenery" introducing the bass that is not there or appear just as a beat into the rithm or harmonic tone....but you listen and you may talk to your nearby friend.

- Listen this bass!

When there's no bass... only inside your brain processor.

Our brain is wonderfull...despite the speed is very slow in processing, it has so many zillions of parallel connections that make it superior to the most modern computer...we have millions of cores if you understand this way... millions of slow processors working at same time and sharing the task in between them.

Well.... sound is awesome.... i have just noticed because i have compared with other units i use together my computer.... and i have used the same speaker i have here in my computer table into the Super A..... difference if like the comparison of water and wine.

My digital camera can record 10 kilohertz but the loss is almost 20 dB... and even this way you can listen some treble in my recordings...say..high frequency treble... tones that appear a little bit poor in the recording due to the lack of superior harmonics.

regards,

Carlos
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Last edited by destroyer X; 29th October 2012 at 03:23 AM.
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Old 29th October 2012, 03:35 AM   #72
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Default If you want to know i have entered, or subscribed, to one more new forum in Brazil

People there respect me and do not bother me...foruns in Brasil does not believe everybody is the same to the law... we do not believe that because the real thing is different.... i do think this equality is fake..not real inside a developed tribe of apes...we came from Apes..watch their behavior and you gonna see this cannot be.

I cannot imagine people doing things some guys did with me, in the past, without forum management to enter, to punish and to block the guy impeaching him to bother Nelson Pass that is one of the most important guys in earth related audio.

My people will never let someone like Nelson be bothered...they will run and kick the guy out in a flash of zillionth of a microsecond..... i am the Brazilian Nelson Pass...and nobody bothers me in Brasil...exception are forum owners.

Why?

When forum starts, then uncle charlie is sweet, works as a workhorse, for free, without any personal interest to obtain profit, always present, posting a lot of things, creating, tweaking and projecting audio amplifiers, inviting people to build, producing advertisement and so on... this makes me an interesting "tool" to invite more guys to the forum...but after some time, forum goes developing and this need will be reducing as forum becomes with thousands and thousands of subscribers...then a lot of business starts to happens inside Brazilian foruns... a lot of advertisers selling 1000 dollars gadgets (audio cables for instance.... with gold and miraculous copper that has no free electrons..ahahahahahah!)... then people ask me thing and i use to say.

- This cable is very good to the ones are selling it making you a fool.

Then i start not to be interesting...and forum management, in Brasil, start to find a good reason to kick me out.

The worst thing is when people start to build my units, to buy parts in group buy and decide to build units that gonna cost 1000 USD or more...when forum has already their brand names to be sold to their subscribers and people do not buy these brands and prefer to build mine (because DIY)...then this reduces their sells.... they fast find a good reason to say i am no good and banish me...happened already three times.

Well..this is the rule here i Brasil..something fake alike "everybody is the same for the law"...foruns here are business..they invite people to sell things to them..this is the target..this is the objective..this is the plan..their "inside job".

People are not the same...if Nelson remove himself from the forum, it will almost die..how we can understand him as the same value as me, for instance....does not make any sense.

regards,

Carlos
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Last edited by destroyer X; 29th October 2012 at 03:41 AM.
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Old 29th October 2012, 04:00 AM   #73
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Carlos, chill out....you are making fine amps.....they work good, many have tried it....do not be defensive..... use your ignore button instead.....

i have my best friend from high school and he is now in the states, he makes a lot of fine tube amps in the 60's and 70's, but if you ask him about technical matters, you get blank stares, but make damn good tube amps he did.......in the end it is the outcome that matters....

there are those who can only do "yappity yaps".....but nothing to show for it when it comes to finished amps....
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Old 29th October 2012, 07:44 AM   #74
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Default Than you very much Tony... you are right...i am defensive

Because i have received a lot of kicks in my back yard... then i became too much alert.

I would like to ask people, please, to remove parts indicated... i found they are not more needed to the Dx Super A.

regards,

Carlos
Attached Images
File Type: jpg Remova partes indicadas.jpg (357.2 KB, 561 views)
File Type: jpg Remove them from blue board.jpg (688.9 KB, 557 views)
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Old 29th October 2012, 01:35 PM   #75
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Default Here you have two examples of adjustment

Dear friends

Simulator is a sophisticated calculator machine, a very good tool for us..but it is based into standard parameters from transistors... the BD139 data the simulator use is not the same as my transistor in real life.

In my home, i have used 560 ohms resistor from Base to Emitter and the trimpot adjusted was exactly and precisely in mid way... mid range... or 100 ohms to our 200 ohms trimpot...this have adjusted the current to 250mA.

You see, that simulators make their own calculations based in their transistor.

As a result of that, before you switch your power on, start with your trimpot in the mid range and read DC milivolts voltage drop directly above and atop of one of the power emitter resistors...then adjust the voltage readed (without signal entering the amplifier) to 25mV if you will be using 2 pairs in the output, and 50mV to a single pair or power transistors in the output.

Check this voltage drop to other emitter resistor and let the amplifier warm up...put some audio and increase the volume till you have distortion in your speaker (be aware this may be more than 90 watts RMS in 8 ohms speakers)... may be interesting to use a dummy load to do that...then, with your heatsink hot (more than 50 degrees celsius) adjust once again and go monitoring your voltage drop to see if it will be increasing.

If this happens, say, the increasing in voltage drop, means your heatsink is not good or not enough...or your ventilation is not fine...or that you may need a fan blower to help you to cool down the whole thing.

Enjoy your amplifier... people that has built said sound is impressive...the same i said to you.... have eated the Dx Blame ST in the breakfast.

We have 100 kits from the blue boards (Supercharged) and 100 kits from the green boards sold (inside group buys, inside brazilian forum, cost price) operating in Brasil....some more units have also being built with folks making home etching of their pcboards.... some of them are upgrading and updating their pcboards to the Dx Super A.

regards,

Carlos
Attached Images
File Type: jpg Adjustment 1.jpg (635.5 KB, 520 views)
File Type: jpg Adjustment 2.jpg (673.7 KB, 434 views)
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Last edited by destroyer X; 29th October 2012 at 01:38 PM.
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Old 29th October 2012, 02:03 PM   #76
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From which manufacturer do you get your BDs, with the rails you use youre pushing them to the limit. They make for excellent driver transistors though better than all if you keep in mind max Vce.
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Old 29th October 2012, 04:25 PM   #77
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Default Yes, they are into their limit, despite i have used them with 55V supplies

I have one amplifier, built last year that is still working, a gift i made to a young student i had... i was teaching him audio electronics...he push the unit hard and daily, he loves to play loud..it is working.

In the reality, i have some voltage drop because supply is not that good..but even this way, full power, even distorted power, it is higher than 45 volts DC.

I will try to know the manufacturer to inform you as soon as possible, i am at work and i have no transistor to watch the brand name at this moment...in a couple of hours i will inform you Homemodder.

You see that they, probably publish specifications considering worst case...real world these components can face more voltage.... but thermal dissipation i do think they publish the best case, exactly the opposite.

I have no doubts it works..reason why i am using it... several units at my home are operating in this same supply...no troubles.... they are doing the job without complains... maybe because supply voltage drop.

If i am not mistaken, you have made this question before...and i have made the same answer to you... yes.... i have this transistor datasheed, from Philips, Onsemi and other manufacturers too.

regards,

Carlos
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Last edited by destroyer X; 29th October 2012 at 04:32 PM.
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Old 29th October 2012, 04:28 PM   #78
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Default Here you have some adjustment instructions in English and Portuguese (Brazilian)

attached,

regards,

Carlos
Attached Images
File Type: jpg Dx Super A - MKII adjustment - ajustes.jpg (736.0 KB, 407 views)
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Old 30th October 2012, 04:35 AM   #79
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Default I already have a lot of guys that wants to make pcboard layout

The first interested is Juan Vargas... and we are working together in perfect harmony.... then i had the offer from Zimmer, yesterday was Naldo, also Herman and today i have perceived that Mitchel is also interested.

Alex mm is another one that use to produce layout too...this time he looks not that interested...but of course he is welcome if he want to move.... to get in action..well..he can made this kind of thing in 10 minutes because highly skilled doing pcboard layout.

This is good, i will open to all of them to produce, this way people will have the choice here in Brazil.

Mitchel is the one use to make layouts... he made the green board after TAJ had give up because too much busy in his work...then he made the Supercharged blue boards.... he said would stop, because studying to a competition to enter Petrobrás...he suceeded and waiting the call to start working draining Oil from presalt oil reserves... i do think he may be in the lawyer departament as he has graduated in laws... he said yes and no...but now he is saying "maybe" because the amplifier is growing up very fast and people here, down in Brasil, is interested.

I do welcome anyone that wants to help... i hate pcboard layout software, i do not want even to learn the stuff...so.... it is opened to people to contribute.

I do not make any secret that i love the work from Mitchel, because he is tuned with my ideas about pcboards..he already made and he knows i want things aligned, i want clearance in between parts, i do not like empty spaces, i do not like big boards and i do like square boards,... not a rectangle... i do think that is not a good idea parts touching one each other as this is not needed..we have room to share clearance in between them, i do love symmetry and the smallest pcboard size possible because of cost...i do love red pcboards, white pcboards, Coffee colour pcboards and blue pcboards and dislike green pcboards...i do prefer jumper instead of long tracks..but better is not to have jumper and to have small lenght to tracks, i do love clearance in between nearby copper tracks to avoid capacitances in between these tracks ... and all that Mitchel already knows and does that automatically without make me spend more than a couple of minutes inspecting... we work together like a well lubricated machine..things goes smoothly... i just go helping him to check if there's a mistake or not in the pcboard..he also knows i hate identification numbers printed (R2, C3, Q5) and he produces images showing these ID numbers but in the pcboard all you can see is values (200 ohms, 1K, 2N5401, 100n)...so... we are deeply tuned while in between Juan and me, we are turning the tune knob to adjust ourselves one to the other.

If Mitchel decide to enter..will be very welcome and will be one more cooperating...for sure he will be accepted in Brasil as he is famous here.

Juan will be producing layout too and all guys that wants to produce will be welcome.

These are the most fresh news about.

On time!... i have just received a message from Mitchel (Miguel Nabuco) he said he will make several layouts... one the new pcboard including the Super A, another will be an adaptor pcboard to use together the Dx Blame ST green board and the Supercharged blue board, another option may be the output filter in an external small pcboard to install nearby the speaker output connector in the amplifier's back panel.

regards,

Carlos
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Last edited by destroyer X; 30th October 2012 at 04:50 AM.
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Old 30th October 2012, 05:25 AM   #80
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Default Here you have Miguel Nabuco, or Mitchel as he is registered

In this forum and have managed group buy in this forum too.

regards,

Carlos
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File Type: jpg Miguel Nabuco - Mitchel.jpg (116.7 KB, 125 views)
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