Tonight I powered-on my "Rachel" - board - the right channel of the BlameES.
I adjusted it:
to the same value (4.78V dropping over the 100 Ohm resistance below the PCB), checked the DC voltage at the speakers output (2 mV), everything o.k.
Then I listened to EVA CASSIDY : "Tall trees in Georgia".
Beautiful sonics - but after approx. one minute: AAAAAArrrgggggHHHH, Rrrrrumms: terrible, awfully loud rumbling noise coming out of the speaker.
I shut down the power at once and inspected the board again.
This is what I found:
A short between the base of the VAS-multiplier (BD139) and the heatsink the BD139 has been attached to.
The short was caused by the M3 screw I used to attach the BD139 (isolated by washers) to the heatsink.
I changed it to a synthetic M3 - screw and re-started the procedure.
No problems since then.
I am still listening to the right channel - "BALSAM in my ears".
"DIY is beautiful", full of wonders and delights - but: be aware of the obstacles, something like a simple M3 - screw.
I will report my "sonic impressions - the psychological ones" - as soon as I have recovered from the M3 - screw - horror happening tonight.
Best regards - Rudi_Ratlos
I adjusted it:
to the same value (4.78V dropping over the 100 Ohm resistance below the PCB), checked the DC voltage at the speakers output (2 mV), everything o.k.
Then I listened to EVA CASSIDY : "Tall trees in Georgia".
Beautiful sonics - but after approx. one minute: AAAAAArrrgggggHHHH, Rrrrrumms: terrible, awfully loud rumbling noise coming out of the speaker.
I shut down the power at once and inspected the board again.
This is what I found:
A short between the base of the VAS-multiplier (BD139) and the heatsink the BD139 has been attached to.
The short was caused by the M3 screw I used to attach the BD139 (isolated by washers) to the heatsink.
I changed it to a synthetic M3 - screw and re-started the procedure.
No problems since then.
I am still listening to the right channel - "BALSAM in my ears".
"DIY is beautiful", full of wonders and delights - but: be aware of the obstacles, something like a simple M3 - screw.
I will report my "sonic impressions - the psychological ones" - as soon as I have recovered from the M3 - screw - horror happening tonight.
Best regards - Rudi_Ratlos
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Good, i am glad you have found the trouble
Enjoy and be happy.
thank you by the lovely picture and the review.
regards,
Carlos
Enjoy and be happy.
thank you by the lovely picture and the review.
regards,
Carlos
to rudi
That is a beautiful amp rudi unfortuntaley for me i had to choose the most stable one i am still learning about amps. I bugged rudi for days asking questions he has been a great help thanks rudi. Carlos thanks to you for designing a splendid amplifier.
That is a beautiful amp rudi unfortuntaley for me i had to choose the most stable one i am still learning about amps. I bugged rudi for days asking questions he has been a great help thanks rudi. Carlos thanks to you for designing a splendid amplifier.
ahahahah...almost 60 thousand hits..you see what some figth does
people run to visit the thread.
Funny those things.
regards,
Carlos🙂🙂
people run to visit the thread.
Funny those things.
regards,
Carlos🙂🙂
My prefered one is the version 1.4.... despite it has errors is the one i like the
most....Volker, Luka and several other folks, including my Brazilian friends have built and they are satisfied..they said no one burned....really the trouble was in my own home...my own power supply.
Other versions sounds good too.... even excelent..but the real astounding quality, i think, is in the 1.4 version.
I do not suggest you to build the 1.4.....if you decide to do it, then do it under your own risk...my obligation is to point you the most stable one..the final version, the 1.5.... the Dx Blame ST, in the place of Dx Blame ES.
regards,
Carlos
most....Volker, Luka and several other folks, including my Brazilian friends have built and they are satisfied..they said no one burned....really the trouble was in my own home...my own power supply.
Other versions sounds good too.... even excelent..but the real astounding quality, i think, is in the 1.4 version.
I do not suggest you to build the 1.4.....if you decide to do it, then do it under your own risk...my obligation is to point you the most stable one..the final version, the 1.5.... the Dx Blame ST, in the place of Dx Blame ES.
regards,
Carlos
Hello all!
My first post on this forum, so I would like to say hello!
I'm gonna build this amp too, so at least two Blames will be playing in Poland. 😀
I started gathering parts, and found some mistakes in part list, C18 is said to be 2.2uF, and schematic shows 220nF in this place, ten times smaller. I guess 220nF is correct? Also, theres 'u'(micro) prefix missing in value description of C12(part list pdf).
regards
Lucas
My first post on this forum, so I would like to say hello!
I'm gonna build this amp too, so at least two Blames will be playing in Poland. 😀
I started gathering parts, and found some mistakes in part list, C18 is said to be 2.2uF, and schematic shows 220nF in this place, ten times smaller. I guess 220nF is correct? Also, theres 'u'(micro) prefix missing in value description of C12(part list pdf).
regards
Lucas
This one happened in between versions 1.4 and 1.5...let's say it is 1.45
well... several versions happened.... and all them because strange signals generated, caused, but a faulting transformer.
Was good... i had the chance to try more variations..of course the CCS to the VAS was tried... and different ones..also different bootstrap "calibrations"...different input..different currents..different transistors.
Some suggestions of friends were applied...Kroto said would be good to remove feedback capacitor..was removed and i have appreciated the stability..but i have lost something i have not courage to say in this forum..ahahahahaha!
I do like some suggestions.... i do not like when people wants to say can do better and try to re-design the amplifier or try to used me as a remote control..pushing buttons and them i will move....alike...do that!...now do those!..now try this!... well...i can do that by myself.... to ask myself to try possibilities.
I cannot accept any criticisms about the amplifier, when made by people have not assembled nor listened...because they do not know what they're talking about...simulators and "i think so" are not science...these things does not sound.
regards,
Carlos
well... several versions happened.... and all them because strange signals generated, caused, but a faulting transformer.
Was good... i had the chance to try more variations..of course the CCS to the VAS was tried... and different ones..also different bootstrap "calibrations"...different input..different currents..different transistors.
Some suggestions of friends were applied...Kroto said would be good to remove feedback capacitor..was removed and i have appreciated the stability..but i have lost something i have not courage to say in this forum..ahahahahaha!
I do like some suggestions.... i do not like when people wants to say can do better and try to re-design the amplifier or try to used me as a remote control..pushing buttons and them i will move....alike...do that!...now do those!..now try this!... well...i can do that by myself.... to ask myself to try possibilities.
I cannot accept any criticisms about the amplifier, when made by people have not assembled nor listened...because they do not know what they're talking about...simulators and "i think so" are not science...these things does not sound.
regards,
Carlos
Attachments
So why You did not? And still posting unreliable schematics with trivial erors!
Carlos, I am about so old as You, and made thousands of amps (99% still working), some very similar to your schematics ,but with measured performance like this SET
I (and many others, now "ignored") tried to help, but if You
You are tryinng not to accept reality.
The audio quality, in my point of view, of course i can be wrong
.. alike everybody.... was consequence of the choices made during the listening tests...the bootstrap to the VAS, the current used in the differential, the current in the first VAS (the load resistance value) and the current used for the VAS.
Here you have a simplified schematic, showing these parts, some voltages and currents.
Today, April 21, is the Brasil Discovery day...year was 1500.... a free day for us..nobody works..only parties here.
We were discovered by Portuguese (Officially) but Pinzon, a Spanish navigator was in the Amazon river and in Recife beaches..the place i am now..he left a construction he made to protect himself against indians..he stopped to colect water and fruits..and them told Spanish king that informed Portuguese king..because an International agreement, these lands belong to Portugal... we are the world biggest Christian nation.
regards,
Carlos
.. alike everybody.... was consequence of the choices made during the listening tests...the bootstrap to the VAS, the current used in the differential, the current in the first VAS (the load resistance value) and the current used for the VAS.
Here you have a simplified schematic, showing these parts, some voltages and currents.
Today, April 21, is the Brasil Discovery day...year was 1500.... a free day for us..nobody works..only parties here.
We were discovered by Portuguese (Officially) but Pinzon, a Spanish navigator was in the Amazon river and in Recife beaches..the place i am now..he left a construction he made to protect himself against indians..he stopped to colect water and fruits..and them told Spanish king that informed Portuguese king..because an International agreement, these lands belong to Portugal... we are the world biggest Christian nation.
regards,
Carlos
Attachments
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You see...so young we are.... 510 years old..and Brazil, is now a days
🙂....the home of the best wide world audio amplifier ever made!..an astonishing super performer, lovely, delicious, superior and the most incredible audio amplifier that ever exists.
of course may exist one or two...or half amplifiers better.....maybe 1/3.... i had not the chance to listen that one...maybe it is yours!
Ahahahahahah!🙂
regards,
Carlos
🙂....the home of the best wide world audio amplifier ever made!..an astonishing super performer, lovely, delicious, superior and the most incredible audio amplifier that ever exists.
of course may exist one or two...or half amplifiers better.....maybe 1/3.... i had not the chance to listen that one...maybe it is yours!
Ahahahahahah!🙂
regards,
Carlos
Attachments
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Picture ( voltages and currents) are measured without signal, in steady state. Try to think about conditions if limiting negative halfwave. Overdrive in signal peaks.
Something like car without brakes. Everything seems OK, till You do not need to stop. But then...
Something like car without brakes. Everything seems OK, till You do not need to stop. But then...
I see BV, seems you love the obvious...without you seems people will never discover
these things you use to tell us.
We thank you....because your wise postings remove our feet from the lame of ignorance.
God was having a good day when have created you...a inspired day... as you discover new things for us....so..stand by is one thing and working is other?
Great!
regards,
Carlos
these things you use to tell us.
We thank you....because your wise postings remove our feet from the lame of ignorance.
God was having a good day when have created you...a inspired day... as you discover new things for us....so..stand by is one thing and working is other?
Great!
regards,
Carlos
I thought today is Wednesday 😛
Anyway guys
Another one on my project list is to build a BlameES for myself - I have to say that the images sent by Rudi_Ratlos are testament to great craftmanship
can I ask -- how hot do those heatsinks get at idle?
cheers chaps
and whatever day it is - the sun is shining, I have a beer and some nuts.... and a volcanic cloud over my head (Apparently) - but life is good.
Anyway guys
Another one on my project list is to build a BlameES for myself - I have to say that the images sent by Rudi_Ratlos are testament to great craftmanship
can I ask -- how hot do those heatsinks get at idle?
cheers chaps
and whatever day it is - the sun is shining, I have a beer and some nuts.... and a volcanic cloud over my head (Apparently) - but life is good.
Hi Andrew - thx for that ...but- not wishing to seem ungrateful or a complete loon - but maths, clever though it is, doesnt represent real life, imo, sorry -- I'm one of those only using maths as a guide.
otherwise we start having to take into account ambient - what grade of aluminium, how good the thermal connect between Transistor and sink and how much volcanic dust lays over the components, etc.
39 degs from ekkart is great, thx
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Cheers, PhaseLockLoopy,
the heatsink I use (150 x 75 x 24 mm) does not get warm at all.
After 2 hours of listening to "decent" volume the heatsink reaches approx. 30 - 35 degrees.
I am no craftsman at all - was born with 2 left hands - but I love colours.
"Colour your life!"
I will not build a case for my BlameES - I will set it up on a medium density fiberboard (MDF), build a small wooden console to contain the speaker-
and cinch-terminals, LCD-display of my pre-AMP, ..., and nail it to the wall above my desk.
Congratulations to your plan to build the BlameES.
Build Version 1.4 !
You will be absolutely delighted when you switch it on the 1.st time and listen to its charming sonics.
Have fun!
Best regards - Rudi_Ratlos
the heatsink I use (150 x 75 x 24 mm) does not get warm at all.
After 2 hours of listening to "decent" volume the heatsink reaches approx. 30 - 35 degrees.
I am no craftsman at all - was born with 2 left hands - but I love colours.
"Colour your life!"
I will not build a case for my BlameES - I will set it up on a medium density fiberboard (MDF), build a small wooden console to contain the speaker-
and cinch-terminals, LCD-display of my pre-AMP, ..., and nail it to the wall above my desk.
Congratulations to your plan to build the BlameES.
Build Version 1.4 !
You will be absolutely delighted when you switch it on the 1.st time and listen to its charming sonics.
Have fun!
Best regards - Rudi_Ratlos
An externally hosted image should be here but it was not working when we last tested it.
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