Depend a lot on speaker design, woofer size, Q value especially
But ofcourse, when you know your amps, and have heard so many, you know the relations between them
But ofcourse, when you know your amps, and have heard so many, you know the relations between them
One more audio...
If you have a flat monitoring PC audio, then reduce bass 4 dB and increase volume to the maximum....say....PC line out volume. PC wave volume and monitor audio amplifier volume.
This was equalized.....hard work, to result flat in your home....to allow you to listen the sonic signature:
YouTube - Dx Blame ES is very nice!.
regards,
Carlos
If you have a flat monitoring PC audio, then reduce bass 4 dB and increase volume to the maximum....say....PC line out volume. PC wave volume and monitor audio amplifier volume.
This was equalized.....hard work, to result flat in your home....to allow you to listen the sonic signature:
YouTube - Dx Blame ES is very nice!.
regards,
Carlos
Let's enjoy the Carnival too....i have spent whole day listening the Blame
We do not feel tired listening.
YouTube - Carnival Candeias, near Recife
regards,
Carlos
We do not feel tired listening.
YouTube - Carnival Candeias, near Recife
regards,
Carlos
Ahahahahahhah!, alike an octopus, the "Corporation" is now holding sports too
Dx also destroy during sportive figths!🙂
YouTube - DX Theme Song
hehehehhe..... nice!
regards,
Carlos
....................................................................................
Dx Corporations does not exist as a real thing...only in our dreams..we go playing about, and all Dx Builder will be one V.I.P from the Corporation..just a game, alike kids playing.
Dx also destroy during sportive figths!🙂
YouTube - DX Theme Song
hehehehhe..... nice!
regards,
Carlos
....................................................................................
Dx Corporations does not exist as a real thing...only in our dreams..we go playing about, and all Dx Builder will be one V.I.P from the Corporation..just a game, alike kids playing.
until today with no success and now both channel into 28 volts and no way to adjust bias ....😕😕😕
No way to adjust bias means oscilations.
Sorry because you are facing that sittuation.... and a very crazy thing, mutant behavior, one day adjust, other day not... in the early beginning was fine, then one channel became bad, now you have two channels bad....interesting and dramatic progression of troubles.
I was very carefull, since the thread beginning, to say folks the amplifier (original) was very unstable...then i worked hard to overcome this trouble...i made my best.
Then i have assembled several amplifier to be sure they are stable, friends of my also have assembled, no one have faced toubles and i have not faced troubles too.
What can i say?...continue to search, because the circuit you have, and the board you have, is the same i am listening here, daily, and i have bias adjusting and nothing wrong here.
The 470pf capacitor is the main one... without it, or using 47pf instead of 470pf, then you will be living in deep troubles.
Have you changed things?... grounding?... wires?... can you post a brand new picture?
I will look forward for better news from you.
regards,
Carlos
Sorry because you are facing that sittuation.... and a very crazy thing, mutant behavior, one day adjust, other day not... in the early beginning was fine, then one channel became bad, now you have two channels bad....interesting and dramatic progression of troubles.
I was very carefull, since the thread beginning, to say folks the amplifier (original) was very unstable...then i worked hard to overcome this trouble...i made my best.
Then i have assembled several amplifier to be sure they are stable, friends of my also have assembled, no one have faced toubles and i have not faced troubles too.
What can i say?...continue to search, because the circuit you have, and the board you have, is the same i am listening here, daily, and i have bias adjusting and nothing wrong here.
The 470pf capacitor is the main one... without it, or using 47pf instead of 470pf, then you will be living in deep troubles.
Have you changed things?... grounding?... wires?... can you post a brand new picture?
I will look forward for better news from you.
regards,
Carlos
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have you tried the capacitor dear Funky2x?
Give a try..... start with 100pF...... if no result, the increase capacitor in steps....for instance, 100, 150, 180,220,270, 330pf.
Solder a piece of wire to the capacitor....the wire free extreme goes soldered in the tranformer center tape ground, the chassis ground.... hold the capacitor using insulating material...then touch the capacitor free lead to all transistor leads...watch the scope sreen or go monitoring your bias voltage....the one is high....use bigger 100 ohms resistance in place if needed...use fan to the heatsinks.
This is a killer method.... this does not work, only, if you have a huge feedback capacitor form the output to input, or other very wrong, feedback type connection....having such kind of mistake, then have to discover, as nothing will stop oscilations before the error be fixed.
Capacitor will work for minor problems only.
regards,
Carlos
Give a try..... start with 100pF...... if no result, the increase capacitor in steps....for instance, 100, 150, 180,220,270, 330pf.
Solder a piece of wire to the capacitor....the wire free extreme goes soldered in the tranformer center tape ground, the chassis ground.... hold the capacitor using insulating material...then touch the capacitor free lead to all transistor leads...watch the scope sreen or go monitoring your bias voltage....the one is high....use bigger 100 ohms resistance in place if needed...use fan to the heatsinks.
This is a killer method.... this does not work, only, if you have a huge feedback capacitor form the output to input, or other very wrong, feedback type connection....having such kind of mistake, then have to discover, as nothing will stop oscilations before the error be fixed.
Capacitor will work for minor problems only.
regards,
Carlos
We have one more building.... nice this one....ssssspecial!
See the picture.....maybe a woman this time.
I could not recognize by the email adress.
hmmmmm.....woman is very good....i hope the one is "she"
We can send some charm and exercise our hunting skills.....goooood!
regard,
Carlos
See the picture.....maybe a woman this time.
I could not recognize by the email adress.
hmmmmm.....woman is very good....i hope the one is "she"
We can send some charm and exercise our hunting skills.....goooood!
regard,
Carlos
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will start from the beginning ... New Board and less wires ..
Hope things go well .
what drive me crazy !!!!!.. that all parts are Ok ..
tomorrow ... new boards ...
Hope things go well .
what drive me crazy !!!!!.. that all parts are Ok ..
tomorrow ... new boards ...
The VAS, the second VAS transistor, the BD139
If you're using heatsink to this one, then remove it.
Heatsink will have contact with the colector...this may create troubles.
I really wish, and i have strong belief and hope, you will find something..... dismount and assemble again may work fine to you, a young guy.... to me, this often does not work.... sadly i really have to find my mistakes not to go doing it all over again.
I am able to repeat the same mistakes again over and over, to watch (for instance) a wrong capacitor without see, to read wrong numbers without perceive, to install inverted transistor and check it twice without perceive it is wrong way..... i hope you are better than me....using the same parts previously mounted, ....if one is wrong, it will go back to the board again...this is what happens with me.
After thousands amplifiers, i have learned i am very bad, and my chances are 25 percent.
Good luck, this may help a lot...some luck.
Carlos
If you're using heatsink to this one, then remove it.
Heatsink will have contact with the colector...this may create troubles.
I really wish, and i have strong belief and hope, you will find something..... dismount and assemble again may work fine to you, a young guy.... to me, this often does not work.... sadly i really have to find my mistakes not to go doing it all over again.
I am able to repeat the same mistakes again over and over, to watch (for instance) a wrong capacitor without see, to read wrong numbers without perceive, to install inverted transistor and check it twice without perceive it is wrong way..... i hope you are better than me....using the same parts previously mounted, ....if one is wrong, it will go back to the board again...this is what happens with me.
After thousands amplifiers, i have learned i am very bad, and my chances are 25 percent.
Good luck, this may help a lot...some luck.
Carlos
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Will tell you a DIY story....my own history, and i was not a beginner anymore
Happened five years ago, i was not too much old..... around half century was my age that time.
I was reconstructing my supply, increasing condensers, rectifiers, installing snubbers, installing a meter.... and i have faced a big trouble, a big mistake...i have installed the positive inverted with the negative.... output cable inverted.... the red one, always positive in my whole life, this time was not positive.
A couple of days latter i was buiding an amplifier, from the internet, an interesting amplifier, a little bit different, unusual feedback and a diode in the positive rail, other small different things were used too.
When i finished to assemble, i have installed the supply, and 100 ohms resistance was there, in series with the supply rails.
Voltage was crazy.... very strange things.... high base to emitter voltage, and i was astonished!.... with high base to emitter voltage the unit was not hot, removing was not burned (open circuit).... i could not understand.... that thing look alike inverted polarity...but inverted polarity use to burn things, short things...nothing smelling, no high current...very strange, and i have no reasons to suspect the polarity, at the end, the red wire is positive!
Man, i was loosing my time, alike an idiot.... really, not alike....i was an
idiot!... and i was removing and replacing, and measuring.... hours passed, my limit lof 4 hours passed, and i use to junk amplifiers when they spend more than 4 hours of my life..this is a rule to me...not to insist with "crazy" circuits, the ones are hard to operate, unstable and bad designs.
I became very angry.... that amplifier was made by someone i have respect....how can this happens this way?..... i could not see the diode.... that diode was the one was protecting the circuit.... even inverted, the current was not crossing.... even with my inverted polarity, nothing was burning...not even condensers, as i do not install condensers when i am adjusting, as they use to fool us while charging and discharging..condensers, rail condensers, goes to the board after the board is aproved..... this is what happens.
I was figthing with the amplifier, a struggle to find errors...and error was in the supply.
Then i fixed the supply mistake, not to fool me once more... the amplifier, of course, worked fine after that.
I am super skilled, thousands amplifiers made, but i can be an idiot very often...i think this is because i am human ....but others may think and idiot...this depends how they feel about me, if they feel i am fair, or if they feel extreme things as love or hate.
We must exercise to be more and more humble.... amplifier construction shows to us how much we can fail....if we fail there, buiding, wrong ideas, wrong thinking, wrong observations, wrong point of views, wrong basis..... this means we can do all these things in our lives, with friends, wife, sons, bosses, employees and so on...we must take care about that.
Video attached, a celebration!, the possibility that we may have a lady in our forum:
http://www.youtube.com/watch?v=PtWy8D8G0i0
regards,
Carlos
Happened five years ago, i was not too much old..... around half century was my age that time.
I was reconstructing my supply, increasing condensers, rectifiers, installing snubbers, installing a meter.... and i have faced a big trouble, a big mistake...i have installed the positive inverted with the negative.... output cable inverted.... the red one, always positive in my whole life, this time was not positive.
A couple of days latter i was buiding an amplifier, from the internet, an interesting amplifier, a little bit different, unusual feedback and a diode in the positive rail, other small different things were used too.
When i finished to assemble, i have installed the supply, and 100 ohms resistance was there, in series with the supply rails.
Voltage was crazy.... very strange things.... high base to emitter voltage, and i was astonished!.... with high base to emitter voltage the unit was not hot, removing was not burned (open circuit).... i could not understand.... that thing look alike inverted polarity...but inverted polarity use to burn things, short things...nothing smelling, no high current...very strange, and i have no reasons to suspect the polarity, at the end, the red wire is positive!
Man, i was loosing my time, alike an idiot.... really, not alike....i was an
idiot!... and i was removing and replacing, and measuring.... hours passed, my limit lof 4 hours passed, and i use to junk amplifiers when they spend more than 4 hours of my life..this is a rule to me...not to insist with "crazy" circuits, the ones are hard to operate, unstable and bad designs.
I became very angry.... that amplifier was made by someone i have respect....how can this happens this way?..... i could not see the diode.... that diode was the one was protecting the circuit.... even inverted, the current was not crossing.... even with my inverted polarity, nothing was burning...not even condensers, as i do not install condensers when i am adjusting, as they use to fool us while charging and discharging..condensers, rail condensers, goes to the board after the board is aproved..... this is what happens.
I was figthing with the amplifier, a struggle to find errors...and error was in the supply.
Then i fixed the supply mistake, not to fool me once more... the amplifier, of course, worked fine after that.
I am super skilled, thousands amplifiers made, but i can be an idiot very often...i think this is because i am human ....but others may think and idiot...this depends how they feel about me, if they feel i am fair, or if they feel extreme things as love or hate.
We must exercise to be more and more humble.... amplifier construction shows to us how much we can fail....if we fail there, buiding, wrong ideas, wrong thinking, wrong observations, wrong point of views, wrong basis..... this means we can do all these things in our lives, with friends, wife, sons, bosses, employees and so on...we must take care about that.
Video attached, a celebration!, the possibility that we may have a lady in our forum:
http://www.youtube.com/watch?v=PtWy8D8G0i0
regards,
Carlos
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More Blame in the production line
Dx boards factory:
YouTube - Dx PCBoard factory
I want to test, myself, the board with the correct size...i have built three, two P2P and one enlarged board with the Official TAJ layout...but enlarged is not the same as the normal one..capacitances and inductances changes.
My friends have assembled using the correct size, two of them have made without any problem...but i cannot know if some small troubles happens in their homes, thousand miles distant from me.... i need to inspect this board with instruments and to use some tricks to see if it really super stable or not....not only visual inspection or listening tests......but using strange loads, strange groundings, strange ground planes, injections of small RF mixed with the audio, coupling the amplifier with an antenna, test it near (20 meters) from a transmitting antenna.... and much more.
I will ask German International, herr Rudi, to produce using his optional board, also to see if happens the same Volker have reported, that bias was not fine...he felt was adjusted to 3.3 and them he found 4.5..... well, this seems normal to me...but we have to inspect, and i will use hot air and will test that here using the standard board and standard schematic, also standard stand by current.
So, do not think i am producing in quantity to sell, this is not my target, maybe to give one or two as gifts for friends, but not for sale.
regards,
Carlos
Dx boards factory:
YouTube - Dx PCBoard factory
I want to test, myself, the board with the correct size...i have built three, two P2P and one enlarged board with the Official TAJ layout...but enlarged is not the same as the normal one..capacitances and inductances changes.
My friends have assembled using the correct size, two of them have made without any problem...but i cannot know if some small troubles happens in their homes, thousand miles distant from me.... i need to inspect this board with instruments and to use some tricks to see if it really super stable or not....not only visual inspection or listening tests......but using strange loads, strange groundings, strange ground planes, injections of small RF mixed with the audio, coupling the amplifier with an antenna, test it near (20 meters) from a transmitting antenna.... and much more.
I will ask German International, herr Rudi, to produce using his optional board, also to see if happens the same Volker have reported, that bias was not fine...he felt was adjusted to 3.3 and them he found 4.5..... well, this seems normal to me...but we have to inspect, and i will use hot air and will test that here using the standard board and standard schematic, also standard stand by current.
So, do not think i am producing in quantity to sell, this is not my target, maybe to give one or two as gifts for friends, but not for sale.
regards,
Carlos
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One more book....you download if you want, then you decide
if you want to buy....then you delete these files and order from Amazon.
Cannot keep without pay for it......just to take a fast look to decide....i will delete mine.
4shared.com - online file sharing and storage - download Electronic.Devices.and.Amplifier.Circuits.rar
regards,
Carlos
if you want to buy....then you delete these files and order from Amazon.
Cannot keep without pay for it......just to take a fast look to decide....i will delete mine.
4shared.com - online file sharing and storage - download Electronic.Devices.and.Amplifier.Circuits.rar
regards,
Carlos
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Hey together...
some things are going on .. ;-)
The amp now is playing stable at 7,9V and already prepared for build in some other components (dac, pre-amp). Today i bought a small preamp, very nice whith good harmonic to the Sankens, great sound 🙂
carlos, you must not comment this post, i know you d´ont like me 😀
some things are going on .. ;-)
The amp now is playing stable at 7,9V and already prepared for build in some other components (dac, pre-amp). Today i bought a small preamp, very nice whith good harmonic to the Sankens, great sound 🙂
carlos, you must not comment this post, i know you d´ont like me 😀
Attachments
Ekkart, Im surprised that you are not having any hum issues, from layout
But it looks good, and Carlos should be proud 😉
But it looks good, and Carlos should be proud 😉
Ekkart, when i do not like someone i use to tell the guy this very clear
I was afraid about this thread future when you have made a comment the bias is a "roller coster"....so.... maybe you have not made effort to protect my amplifiers when said that.
This spread panic!, and people that was thinking to build give up afraid the amplifier is a time bomb...so, this is against my will to have lots of guys enjoying this lovely amplifier...of course i was not happy with that.
I was not happy with these words, and you because was the one that have planted the seed of amplifier terrorism;
I use to forget those things once, twice and three times...and them i start to really dislike the guy.... one, twice and three times because i am not perfect and i use to do things alike from time to time...so, i cannot ask people to be perfect when i am not.
Congratulations you have made it nice.
I am very proud, of course, in special that Volker came back to show his amplifier to us.
Peace brother!
Carlos
...................................................................................................................
But, as you said bias is a roller coster, or that goes up and down (normal because temperature), the revenge, the payback is to say your condenser is wrong, out of angle, not well soldered..also your table needs varnish or is dirty.
ahahahahahahah!
I was afraid about this thread future when you have made a comment the bias is a "roller coster"....so.... maybe you have not made effort to protect my amplifiers when said that.
This spread panic!, and people that was thinking to build give up afraid the amplifier is a time bomb...so, this is against my will to have lots of guys enjoying this lovely amplifier...of course i was not happy with that.
I was not happy with these words, and you because was the one that have planted the seed of amplifier terrorism;
I use to forget those things once, twice and three times...and them i start to really dislike the guy.... one, twice and three times because i am not perfect and i use to do things alike from time to time...so, i cannot ask people to be perfect when i am not.
Congratulations you have made it nice.
I am very proud, of course, in special that Volker came back to show his amplifier to us.
Peace brother!
Carlos
...................................................................................................................
But, as you said bias is a roller coster, or that goes up and down (normal because temperature), the revenge, the payback is to say your condenser is wrong, out of angle, not well soldered..also your table needs varnish or is dirty.
ahahahahahahah!
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Hmm, different amp, but I have had to fineadjust bias about once a year
After about 3years it seems more stable
But I expect I will have to adjust again
I dont expect any amps will be 100% on bias
But maybe some really are
But I check at least once a year
I usually know by touching heatsinks, but only possible with monos, ofcourse
But sure, I really hate to touch amps that are working, and fear the worst every time
After about 3years it seems more stable
But I expect I will have to adjust again
I dont expect any amps will be 100% on bias
But maybe some really are
But I check at least once a year
I usually know by touching heatsinks, but only possible with monos, ofcourse
But sure, I really hate to touch amps that are working, and fear the worst every time
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