German board tested...i found problem with the Dx Blame ES circuit
the board is fine..the problem belongs to the Blame ES circuit.
Tested also, once again, using the Blame ST schematic..then...no troubles.... as shown in older videos produced.
YouTube - Blame amplifier tunning made_mpeg2video.mpg
regards,
Carlos
the board is fine..the problem belongs to the Blame ES circuit.
Tested also, once again, using the Blame ST schematic..then...no troubles.... as shown in older videos produced.
YouTube - Blame amplifier tunning made_mpeg2video.mpg
regards,
Carlos
many times in the past and also now days many of us have to pay our respects to uncle Charly for his work
It is not really importand if the DX or the Blame is the best or the worst amplifier presented in the forum ....what makes sense and its more useful is that there is a non stop effort to make DX products better and better
Respect .... uncle Charly .
It is not really importand if the DX or the Blame is the best or the worst amplifier presented in the forum ....what makes sense and its more useful is that there is a non stop effort to make DX products better and better
Respect .... uncle Charly .
Alternative Parts
Because I had such a hard time finding alternates to the transistors i needed, I've decided to create a list of alternatives for all the transistors. Hopefully this will help anyone looking for alternates.
BC556: MPSA56, MPSA55
BC546: MPSA06, MPSA05
BD139: BD179
BD140: 2N4920
I don't understand why it's so hard to get the transistors i need. I still don't have half the transistors i need... I only have three BC556, and one 2SC5200...
Because I had such a hard time finding alternates to the transistors i needed, I've decided to create a list of alternatives for all the transistors. Hopefully this will help anyone looking for alternates.
BC556: MPSA56, MPSA55
BC546: MPSA06, MPSA05
BD139: BD179
BD140: 2N4920
I don't understand why it's so hard to get the transistors i need. I still don't have half the transistors i need... I only have three BC556, and one 2SC5200...
Try BC547 and BC557 in the place of BC546 and BC556
this is connected to country tradition...i can find these ones in thousands of shops... they may have no solder that people that sells electronics always have.... as this is alike hamburger style of sandwich without meat..... so.... electronic shop without solder is alike hamburger sandwich without meat...or hot dog without sausage.
If you find here, one shop that has not solder, for sure it will have hundreds of BC548, BC547, BC557, BC548, BC556, BD135, BD139 and BD140...because these ones are Universal substitutes..... till 35 volts they can substitute any transistor.
You know what i mean..in brazil you can find a shop that has not solder...an electronic shop that has not solder to sell... also you can find hot dog without sausage..but you cannot find a shop that has not these transistors..they are standard...talking about transistors is the same to say BC546 here.
It is interesting these things... fame.... in England (UK) i know people have, always..the same way their hot dog has sausages, these MPS transistors.... and we do not have them!...we know our BCs can do the same job, reason why we do not bother to have those ones here.
It is a pitty you are facing that.... brazilian junk yards are filled with these transistors.... the shop that fixes television, repair shop, put enormous old television having hundreds of these BC transistor inside...we use them to automobile relay..electronic lamps flashing....to everything...even electronic lamps..intercommunicators, telephone sets and centrals... everywhere...it is standard in this giant country that may have ten thousand electronic shops..and you will not find a single one that has not these ones.
Well...keep searching...or.... desperatelly, try the 2N5401 and 2N5551.... i am afraid of them as i had troubles once, in this same amplifier...but maybe was that hell transformer that was creating me problems.
For drivers you can try TIP41 and TIP42...also MJE15032 and it's complementary..but do not use MJE340 because i have burned all units i had..the hell unit oscilates very easy...i want to have the devil inside my home and not have MJE340 and MJE350!... to the first VAS...try to use BC546 if possible.
I cannot guarantee you will succed..but you should try.... other ones...but be prepared o face surprises.
Well... you can assemble, just to try, with the ones you found... them, slowly, without hurry, you go searching for the ones suggested in the schematic.
Transistors use to work without create too much troubles.... maximum colector to emitter voltage is something to worry about.... gain is another thing...maximum dissipation too, and if PNP or NPN...and in almost all cases the amplifier works...not perfectly, but almost perfectly...measuring you find small differences and simulating the distortion changes a lot depending the transistors...but these changes in distortions are not important, as the distortion is below your threshold of audibility...say...below 0.1% no one perceive differences...so... a transistor replacement that increases the distortion from 0.002% to 0.023% is not even perceived..as both values are below the levels of distortion we can perceive.
I can guarantee the ones i am using..the ones i have tested...others.... try them under your own risk..... who knows...the sound can be even better...we never know... at least i do not know.
regards,
Carlos
this is connected to country tradition...i can find these ones in thousands of shops... they may have no solder that people that sells electronics always have.... as this is alike hamburger style of sandwich without meat..... so.... electronic shop without solder is alike hamburger sandwich without meat...or hot dog without sausage.
If you find here, one shop that has not solder, for sure it will have hundreds of BC548, BC547, BC557, BC548, BC556, BD135, BD139 and BD140...because these ones are Universal substitutes..... till 35 volts they can substitute any transistor.
You know what i mean..in brazil you can find a shop that has not solder...an electronic shop that has not solder to sell... also you can find hot dog without sausage..but you cannot find a shop that has not these transistors..they are standard...talking about transistors is the same to say BC546 here.
It is interesting these things... fame.... in England (UK) i know people have, always..the same way their hot dog has sausages, these MPS transistors.... and we do not have them!...we know our BCs can do the same job, reason why we do not bother to have those ones here.
It is a pitty you are facing that.... brazilian junk yards are filled with these transistors.... the shop that fixes television, repair shop, put enormous old television having hundreds of these BC transistor inside...we use them to automobile relay..electronic lamps flashing....to everything...even electronic lamps..intercommunicators, telephone sets and centrals... everywhere...it is standard in this giant country that may have ten thousand electronic shops..and you will not find a single one that has not these ones.
Well...keep searching...or.... desperatelly, try the 2N5401 and 2N5551.... i am afraid of them as i had troubles once, in this same amplifier...but maybe was that hell transformer that was creating me problems.
For drivers you can try TIP41 and TIP42...also MJE15032 and it's complementary..but do not use MJE340 because i have burned all units i had..the hell unit oscilates very easy...i want to have the devil inside my home and not have MJE340 and MJE350!... to the first VAS...try to use BC546 if possible.
I cannot guarantee you will succed..but you should try.... other ones...but be prepared o face surprises.
Well... you can assemble, just to try, with the ones you found... them, slowly, without hurry, you go searching for the ones suggested in the schematic.
Transistors use to work without create too much troubles.... maximum colector to emitter voltage is something to worry about.... gain is another thing...maximum dissipation too, and if PNP or NPN...and in almost all cases the amplifier works...not perfectly, but almost perfectly...measuring you find small differences and simulating the distortion changes a lot depending the transistors...but these changes in distortions are not important, as the distortion is below your threshold of audibility...say...below 0.1% no one perceive differences...so... a transistor replacement that increases the distortion from 0.002% to 0.023% is not even perceived..as both values are below the levels of distortion we can perceive.
I can guarantee the ones i am using..the ones i have tested...others.... try them under your own risk..... who knows...the sound can be even better...we never know... at least i do not know.
regards,
Carlos
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I found this recording, made by Hudnes, from Brazil
Lovely music and great audio...he informed made the video using Cell Phone Camera Nokia T78 or something alike.
YouTube - MY DX BLAME ST
regards,
Carlos
Lovely music and great audio...he informed made the video using Cell Phone Camera Nokia T78 or something alike.
YouTube - MY DX BLAME ST
regards,
Carlos
I have anything sophisticated here.... just a DVD player from Philips, a computer
audio board that generates my music and some Flac recordings.
The system here is simple, sounds good.
People using better speaker and better sources, may have even better performance.
I cannot afford to have expensive equipment, so, i use to do the best i can with the resources i have.
Also, i think to have good sonics with simple equipment, not spending money, is better (more pleasant and more heroic) than to obtain quality with expensive units..... i am DIY...i am inside a DIY forum because of that same reason...i am on topic for this forum....i am not someone that buy audio...i cannot, and even if i could...i will never do that.... reduces the fun this way.
To have the best buying the best?..... not very good..better to have the best sound with ordinary, regular, common and standard audio sources and speakers.... well.... this is my opinion.
I cannot discuss brands my friend..i am not able...i do not know them...so, i am ignorant in that subject.
This thread, just to remember, is about Dx Blame amplifier, to build, a diy thread.
regards,
Carlos
audio board that generates my music and some Flac recordings.
The system here is simple, sounds good.
People using better speaker and better sources, may have even better performance.
I cannot afford to have expensive equipment, so, i use to do the best i can with the resources i have.
Also, i think to have good sonics with simple equipment, not spending money, is better (more pleasant and more heroic) than to obtain quality with expensive units..... i am DIY...i am inside a DIY forum because of that same reason...i am on topic for this forum....i am not someone that buy audio...i cannot, and even if i could...i will never do that.... reduces the fun this way.
To have the best buying the best?..... not very good..better to have the best sound with ordinary, regular, common and standard audio sources and speakers.... well.... this is my opinion.
I cannot discuss brands my friend..i am not able...i do not know them...so, i am ignorant in that subject.
This thread, just to remember, is about Dx Blame amplifier, to build, a diy thread.
regards,
Carlos
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Too much big to be uploaded Kanwar
Also i have no Brazilian music in Flac format...the one may have is Mr. Professor.
I have one, but was traditional PCM format (wave)...and the one is even bigger.
My upload speed is slow.... maximum of 100 kbps.... the upload speed is 10 times bigger.
To send Flac or wave, represents 30 minutes of upload. (average)
regards,
Carlos
.......................................................................................................
BTW... is really you that is using Workhorse nickname?.... you seem different.... or your brother, or even Sami is using by you?
Also i have no Brazilian music in Flac format...the one may have is Mr. Professor.
I have one, but was traditional PCM format (wave)...and the one is even bigger.
My upload speed is slow.... maximum of 100 kbps.... the upload speed is 10 times bigger.
To send Flac or wave, represents 30 minutes of upload. (average)
regards,
Carlos
.......................................................................................................
BTW... is really you that is using Workhorse nickname?.... you seem different.... or your brother, or even Sami is using by you?
Attachments
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My internet, dear Kanwar, also does not attach files bigger than 25 megabytes
So, i have tried but i could not.
Wave files and Flac files, usually are bigger than 50 Megabytes.
Quality difference is huge..... Flac is much better than MP3 320K
I have no FTP adress to send you computer to computer.
regards,
Carlos
So, i have tried but i could not.
Wave files and Flac files, usually are bigger than 50 Megabytes.
Quality difference is huge..... Flac is much better than MP3 320K
I have no FTP adress to send you computer to computer.
regards,
Carlos
Thank you Wayne..... by your interest to see my videos
Thank you,
regards,
Carlos
YouTube - DIY Fest Rio 2010 - Dx Blame ST
YouTube - DIY Fest Rio 2010 - Farjon fotos
Thank you,
regards,
Carlos
YouTube - DIY Fest Rio 2010 - Dx Blame ST
YouTube - DIY Fest Rio 2010 - Farjon fotos
This brazilian friend made Dx Blame test using DAC and a pré amplifier
A tube pré amplifier called Aikido.
His name is Hudnes, he lives in Maceio, Capital of the state of Alagoas.... Northeast of brazil too... this state touches mine, has border with Pernambuco at south of my place.
YouTube - MY DIY STEREO, DX BLAME ST, AIKIDO
Video is not fine...but audio is nice.
enjoy,
regards,
Carlos
A tube pré amplifier called Aikido.
His name is Hudnes, he lives in Maceio, Capital of the state of Alagoas.... Northeast of brazil too... this state touches mine, has border with Pernambuco at south of my place.
YouTube - MY DIY STEREO, DX BLAME ST, AIKIDO
Video is not fine...but audio is nice.
enjoy,
regards,
Carlos
no.
A 50W into 8ohm amplifier must output 20Vac to an 8r0 load. P=Vac^2/R
The peak voltage will be 28.3Vpk.
You will lose ~2V through the amplifier so the PSU should supply ~+-30Vdc, when fully loaded, to the amplifier power terminals.
The PSU voltage will rise ~4V when unloaded. Expect the PSU to be ~+-35Vdc for a 50W amplifier.
If you start with +-25Vdc, then maximum power is likely to be 20W to 25W into 8r0.
If you listen to average levels of ~-20dB ref maximum power then your 25W amplifier will be delivering 250mW to the speaker when turned up to maximum with that 20dB overhead to prevent clipping of peak transients.
Yes...Andrew is right about the technical point of view
In the reality, audible difference when you compare a 25W amplifier with another one with 50W output is not clear..not huge....not easy to perceive...so....will play loud as you have imagined....about they can play loud and powerfull using 25 volts?...the answer is yes.
regards,
Carlos
In the reality, audible difference when you compare a 25W amplifier with another one with 50W output is not clear..not huge....not easy to perceive...so....will play loud as you have imagined....about they can play loud and powerfull using 25 volts?...the answer is yes.
regards,
Carlos
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