Dx Blame ST, using 55V supplies, simulator results.
183W rms - 7 ohms load, input 974 mV peak - THD lower than 0.002%... using 4 output pairs if your supply voltage do not drop down.
337W rms - 3.5 ohms load, input 934 mV peak - THD lower than 0.009%... using 6 output pairs.
496W rms - 2 ohms load, input 856 mV peak - THD lowr than 0.018%...using 10 output pairs.
regards,
Carlos
183W rms - 7 ohms load, input 974 mV peak - THD lower than 0.002%... using 4 output pairs if your supply voltage do not drop down.
337W rms - 3.5 ohms load, input 934 mV peak - THD lower than 0.009%... using 6 output pairs.
496W rms - 2 ohms load, input 856 mV peak - THD lowr than 0.018%...using 10 output pairs.
regards,
Carlos
Dx Blame ST, using 55V supplies, simulator results..current demmand
183W - 7 ohms, you gonna have 2A to each rail... current consumption is 220w
337W - 3.5 ohms, you will have 4A to each rail.... current consumption is 440w
496W - 2 ohms, you will drain 7A to each rail.... current consumption is 770W
real life is another story...usually transformer voltage drops at least 10 percent...so, your power will not be this one..this is simulation only.
regards,
Carlos
183W - 7 ohms, you gonna have 2A to each rail... current consumption is 220w
337W - 3.5 ohms, you will have 4A to each rail.... current consumption is 440w
496W - 2 ohms, you will drain 7A to each rail.... current consumption is 770W
real life is another story...usually transformer voltage drops at least 10 percent...so, your power will not be this one..this is simulation only.
regards,
Carlos
Test made with the Dx Blame ST - 55V - the adjustments, the VBE, the off set
and some scope images:
YouTube - Dx Blame St - 55V - 7 mV off set
YouTube - Dx Blame ST - 55V - 12 ohms series resistances
YouTube - Dx Blame ST - 55V - 26 volts output - 100W
YouTube - Dx Blame ST - 55V - power tr VBE - 530mV
YouTube - Dx Blame ST - 55V - VAS II VBE 544mV
YouTube - Dx Blame ST - 55V - driver VBE - 548mV
YouTube - Dx Blame ST - 55V - first stage VBE - 560mV
YouTube - Dx Blame ST - 55V - first VAS VBE - 570mV
YouTube - Dx Blame ST - 55V - fast scope inspections
YouTube - Dx Blame ST - 55V - full power sweep
YouTube - Dx Blame ST - 55V - output voltage, finger generator
YouTube - Dx Blame ST - 55V - lots of power
YouTube - Dx Blame ST - 55V - positive rail std by current
YouTube - Dx Blame ST - 55V - low frequency power
YouTube - Dx Blame ST - the simple setup used to test
YouTube - Dx Blame ST - 55V - bias trimpot preset resistance
YouTube - Dx Blame ST - 55V - Bias, we need to be faster
YouTube - 570 mV, second TR, feedback one, VBE.avi
http://www.youtube.com/watch?v=5d435FSTlcM
- " Dx Corporation....we work hard!"
regards,
Carlos
and some scope images:
YouTube - Dx Blame St - 55V - 7 mV off set
YouTube - Dx Blame ST - 55V - 12 ohms series resistances
YouTube - Dx Blame ST - 55V - 26 volts output - 100W
YouTube - Dx Blame ST - 55V - power tr VBE - 530mV
YouTube - Dx Blame ST - 55V - VAS II VBE 544mV
YouTube - Dx Blame ST - 55V - driver VBE - 548mV
YouTube - Dx Blame ST - 55V - first stage VBE - 560mV
YouTube - Dx Blame ST - 55V - first VAS VBE - 570mV
YouTube - Dx Blame ST - 55V - fast scope inspections
YouTube - Dx Blame ST - 55V - full power sweep
YouTube - Dx Blame ST - 55V - output voltage, finger generator
YouTube - Dx Blame ST - 55V - lots of power
YouTube - Dx Blame ST - 55V - positive rail std by current
YouTube - Dx Blame ST - 55V - low frequency power
YouTube - Dx Blame ST - the simple setup used to test
YouTube - Dx Blame ST - 55V - bias trimpot preset resistance
YouTube - Dx Blame ST - 55V - Bias, we need to be faster
YouTube - 570 mV, second TR, feedback one, VBE.avi
http://www.youtube.com/watch?v=5d435FSTlcM
- " Dx Corporation....we work hard!"
regards,
Carlos
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In the full power sweep video, clipping behaviour is completely abnormal with heavy sticking to the negative rail. This can cause the amplifier to self destroy. Current limiting the VAS will most likely solve this, as already pointed out several times.
Andrew T and some other forum friends have criticised the absence of
limiter installed to the VAS.... i have told them, several times, this was tested (in this case was the Precision 1) and the transistors have survived to all torture i could make.
But they have insisted a lot.... came other, and more other...and them a group of forum friends were there making audio electronic terrorism, saying gonna explode...they are always the same folks.
Happened that i have perceived builder candidates where going to be scared to build...because of that i give up to defend my point of view where i was saying this produces harm effect in dinamics.....this appear clearly limiting power peaks.... amplifier turns lifeless...the best you adjust the threshold of action, having huge currents (huge power), the hell thing will drain current to the negative line...and this seems reduce the level.
This time, i will not accept their pressure..they can come in groups of hundreds and i will not suggest your to install the limiter.
Here you have the image, the hell limiter that reduced, a lot, the Precision 1 performance..... it is up to you....not suggested...not with my appointment.
Those guys are not flexible..they have theories and books alike bibble...we cannot go against because they come to defend these things...and they communicatte one each other..they come in groups..the boring platoon.. i really think they have never tried with and without these things...if they do that..they will finish with this boring conversation.... the amplifiers these three most boring folks design may be very bad in sonics...i have built one, from one of them.... terrible..... the problem is that they watch scopes and do not bother with listening tests...so...their scopes and themselves feel good...but when you play...aaaaagh!
Almost fifty folks have built the Precision 1...they have not complained.... i was lucky they have removed the protection by themselves.
regards,
Carlos
limiter installed to the VAS.... i have told them, several times, this was tested (in this case was the Precision 1) and the transistors have survived to all torture i could make.
But they have insisted a lot.... came other, and more other...and them a group of forum friends were there making audio electronic terrorism, saying gonna explode...they are always the same folks.
Happened that i have perceived builder candidates where going to be scared to build...because of that i give up to defend my point of view where i was saying this produces harm effect in dinamics.....this appear clearly limiting power peaks.... amplifier turns lifeless...the best you adjust the threshold of action, having huge currents (huge power), the hell thing will drain current to the negative line...and this seems reduce the level.
This time, i will not accept their pressure..they can come in groups of hundreds and i will not suggest your to install the limiter.
Here you have the image, the hell limiter that reduced, a lot, the Precision 1 performance..... it is up to you....not suggested...not with my appointment.
Those guys are not flexible..they have theories and books alike bibble...we cannot go against because they come to defend these things...and they communicatte one each other..they come in groups..the boring platoon.. i really think they have never tried with and without these things...if they do that..they will finish with this boring conversation.... the amplifiers these three most boring folks design may be very bad in sonics...i have built one, from one of them.... terrible..... the problem is that they watch scopes and do not bother with listening tests...so...their scopes and themselves feel good...but when you play...aaaaagh!
Almost fifty folks have built the Precision 1...they have not complained.... i was lucky they have removed the protection by themselves.
regards,
Carlos
Attachments
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Hi,
and what is Q10 bias current?
The bias current and the 22r protection sensing resistor are intimately connected.
Is there any current limiting in Q9 collector?
and what is Q10 bias current?
The bias current and the 22r protection sensing resistor are intimately connected.
Is there any current limiting in Q9 collector?
I have a clear imagination about these folks having strong emotions watching the
scope screen....two of you of course:
- Yesssss
- More!
- Gooooood!..
- increase level!..more!...more!..turn it up....up!.....yessssss.
- Now!....more!..... the distor...distor....distortion is coming!...yesssssssssss.!
- 0.001%...was good!
- Was good for you dear?.
- Yes..you're the best (since last week)
ahahahahahah!
regards,
Carlos
scope screen....two of you of course:
- Yesssss
- More!
- Gooooood!..
- increase level!..more!...more!..turn it up....up!.....yessssss.
- Now!....more!..... the distor...distor....distortion is coming!...yesssssssssss.!
- 0.001%...was good!
- Was good for you dear?.
- Yes..you're the best (since last week)
ahahahahahah!
regards,
Carlos
Attachments
I do not know Andrew..... take a look at the schematic, i think you are able to
calculate this, and fast, and without the need of a handy calculator.
It may be in between 5 to 8 miliamperes...this is the current i love to use in the VAS...my prefered one is 7 miliamperes.
We need much less..but i think some reserve may be interesting.
This 22 ohms value was your suggestion..from 15 to 22 if i can remember.
You!...yeah!..you are one of them....heheheheh..that Platoon.
Another one that loves V/I limiters is my dear friend from East Electronics..but this one became a very good friend...he do not bothers me anymore.
regards,
Carlos
calculate this, and fast, and without the need of a handy calculator.
It may be in between 5 to 8 miliamperes...this is the current i love to use in the VAS...my prefered one is 7 miliamperes.
We need much less..but i think some reserve may be interesting.
This 22 ohms value was your suggestion..from 15 to 22 if i can remember.
You!...yeah!..you are one of them....heheheheh..that Platoon.
Another one that loves V/I limiters is my dear friend from East Electronics..but this one became a very good friend...he do not bothers me anymore.
regards,
Carlos
Attachments
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I am very satisfied with this amplifier sonics..it is now stable and do not need
further modifications...some signs of unstability happens when you enter the clipping...and advance the volume further and further (no one will do that..if the one do that..deserves the distortions) .but no one is stupid enougth, or deaf enougth, to enter several volts of square wave in the amplifier input, having low impedance loads connected to the output AND using that one, my defective toroidal transformer...this unit, the guy must come to Brazil to collect it from me...... so.....the conditions to have troubles are not easy to achieve.
I am listening, and super happy and satisfied with the best sound amplifier ever made..the best sonics, the lovely performance and some signs of unstability did not harm the sound...this shows, once again, that simulator, instruments, cannot indicate, with precision, how good an amplifier will sound.
The amplifier is finished dear Tinitus, closed to modifications, to update and upgrade..the guilty one was found, the transformer..not the amplifier... so, the unit is free to be spread world wide.
We gonna see people building ... we gonna see the miracle of multiplication once more.
hehehehe...at least i hope so.
About possible.everything is possible..nothing is impossible!....as you know dear Tinitus, as you have never finished your Dx amplifier board..the one ethernally "under construction..or under development"......years have passed..hundreds built the amplifier and you are still thinking about the board.... this lack of decision, to say it is good enougth, is stopping your production.
Well..everything is possible, also cascode and other options..but..if we do not decide when to stop..things becomes alike unfinished melody...imagine if you go improving your violines...you gonna die because old, and no one will be ready.... everything can be improved, and transformed in other things..but this vanishes the first one..is the game of kill and ressurrect...kill the previous one to re create another one....not a good idea.... you know...less one and more one results nothing.zero!..nothing happens..just the game of create and reject.
My amplifier were made this way.... the first one, modified, become the HRII...then i have made Precision 1 and so on...if i had doubts..i would be still thinking in the Dx amplifier, the standard one.and no one had the pleasure to assemble that lovely amplifier..... not only them..but i would loose the pleasure the see them buiding and feeling good with their amplifiers.... We have to decide...to stop tweaking and to deliver when good enougth.
Imagine if Aksa was that way...always tweaking and never deciding to finish...the lovely Aksa 55 would not be sold in thousands around the world..happened..because one day he said.
- "Good enougth!"
regards,
Carlos
further modifications...some signs of unstability happens when you enter the clipping...and advance the volume further and further (no one will do that..if the one do that..deserves the distortions) .but no one is stupid enougth, or deaf enougth, to enter several volts of square wave in the amplifier input, having low impedance loads connected to the output AND using that one, my defective toroidal transformer...this unit, the guy must come to Brazil to collect it from me...... so.....the conditions to have troubles are not easy to achieve.
I am listening, and super happy and satisfied with the best sound amplifier ever made..the best sonics, the lovely performance and some signs of unstability did not harm the sound...this shows, once again, that simulator, instruments, cannot indicate, with precision, how good an amplifier will sound.
The amplifier is finished dear Tinitus, closed to modifications, to update and upgrade..the guilty one was found, the transformer..not the amplifier... so, the unit is free to be spread world wide.
We gonna see people building ... we gonna see the miracle of multiplication once more.
hehehehe...at least i hope so.
About possible.everything is possible..nothing is impossible!....as you know dear Tinitus, as you have never finished your Dx amplifier board..the one ethernally "under construction..or under development"......years have passed..hundreds built the amplifier and you are still thinking about the board.... this lack of decision, to say it is good enougth, is stopping your production.
Well..everything is possible, also cascode and other options..but..if we do not decide when to stop..things becomes alike unfinished melody...imagine if you go improving your violines...you gonna die because old, and no one will be ready.... everything can be improved, and transformed in other things..but this vanishes the first one..is the game of kill and ressurrect...kill the previous one to re create another one....not a good idea.... you know...less one and more one results nothing.zero!..nothing happens..just the game of create and reject.
My amplifier were made this way.... the first one, modified, become the HRII...then i have made Precision 1 and so on...if i had doubts..i would be still thinking in the Dx amplifier, the standard one.and no one had the pleasure to assemble that lovely amplifier..... not only them..but i would loose the pleasure the see them buiding and feeling good with their amplifiers.... We have to decide...to stop tweaking and to deliver when good enougth.
Imagine if Aksa was that way...always tweaking and never deciding to finish...the lovely Aksa 55 would not be sold in thousands around the world..happened..because one day he said.
- "Good enougth!"
regards,
Carlos
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Waveforms on oscilloscope usually reveal many potential amplifier failure modes.
Also, I used to check bias stability by making the amplifier play loud for some time (to produce some heating) and then immediately removing the signal and the load and measuring voltage drop across emitter resistors. This test may give some surprises on traditional designs, where the bias deviates a lot from the expected value when outputting some power (as much as 10x with the corresponding stress to output devices). That led me to use a two transistor Vbe multiplier and experiment with sense transistor/diodes placement.
An amplifier with traces of instability near clipping is a blown amplifier. This partial instability may turn into full destructive instability randomly depending on temperature, load, supply voltage and the batch of transistors used. Midrange and trebble transients will make the amplifier clip for very brief periods of time when playing loud, that's not hearable at all, but is enough to trigger oscillation and kaboom 😉
I believe all your designs suffer from that problem because you have never cared about it until now.
Any trace of instability means less than 0 degree phase margin, which should always be at least 45 degrees.
Oh, are you still ignoring my posts? I have many many lessons to teach you about making class AB amplifiers work as expected. Translating simulation circuits into real circuits is not a direct process, models are not accurate. Then we can start with class D 😀😀😀
Also, I used to check bias stability by making the amplifier play loud for some time (to produce some heating) and then immediately removing the signal and the load and measuring voltage drop across emitter resistors. This test may give some surprises on traditional designs, where the bias deviates a lot from the expected value when outputting some power (as much as 10x with the corresponding stress to output devices). That led me to use a two transistor Vbe multiplier and experiment with sense transistor/diodes placement.
An amplifier with traces of instability near clipping is a blown amplifier. This partial instability may turn into full destructive instability randomly depending on temperature, load, supply voltage and the batch of transistors used. Midrange and trebble transients will make the amplifier clip for very brief periods of time when playing loud, that's not hearable at all, but is enough to trigger oscillation and kaboom 😉
I believe all your designs suffer from that problem because you have never cared about it until now.
Any trace of instability means less than 0 degree phase margin, which should always be at least 45 degrees.
Oh, are you still ignoring my posts? I have many many lessons to teach you about making class AB amplifiers work as expected. Translating simulation circuits into real circuits is not a direct process, models are not accurate. Then we can start with class D 😀😀😀
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Sorry Carlos, but schematic posted in 1068 ("precision") shows that You are gain repeating the same mistakes. Using BD140 (Uceo max. 80V!) exposed to voltage swing about 110V is more than 30V over allowed rating, destruction is very near..
Capacitors C23-C25 are in wrong placen (should be paralel to R27), they supres unction of base stopers resistors, again potentially instability.
C26 is "must" not optional. 2SC4793 is not suitable or VAS (it is driver..) too big Cob, R24, R25 bypassed by capacitors have no sense,Q7 will not save Q9 at overdive (this configuration has sense in amplifiers with overcurrent protection), whole current (needed to activate Q7) to R19 will flow thrue base of Q10 (no chance to flow via colector Q10), so Q9 is exposed to Pc about 1,4W..And Q7 is source of local instability (local NFB acting against global NB..) No output inductor means again instability with capacitive load (amplifier with relatively strong overal NFB). Fuse in output, causing distortion at LF (fuse resistance thermal modulation). CFP input (potential for slightly lower distortion), but no CSS for input dif. pair... And here are much more mistakes, but You will not hear it.
Eva is 100% right, Your videos shows very heavy stability and recovery problems after overdrive. So, i suppose, You will ad me to block list..but your amplifiers do not stop to blow.
"Do not confuse me with facts, I have already made my opinion"😛
Capacitors C23-C25 are in wrong placen (should be paralel to R27), they supres unction of base stopers resistors, again potentially instability.
C26 is "must" not optional. 2SC4793 is not suitable or VAS (it is driver..) too big Cob, R24, R25 bypassed by capacitors have no sense,Q7 will not save Q9 at overdive (this configuration has sense in amplifiers with overcurrent protection), whole current (needed to activate Q7) to R19 will flow thrue base of Q10 (no chance to flow via colector Q10), so Q9 is exposed to Pc about 1,4W..And Q7 is source of local instability (local NFB acting against global NB..) No output inductor means again instability with capacitive load (amplifier with relatively strong overal NFB). Fuse in output, causing distortion at LF (fuse resistance thermal modulation). CFP input (potential for slightly lower distortion), but no CSS for input dif. pair... And here are much more mistakes, but You will not hear it.
Eva is 100% right, Your videos shows very heavy stability and recovery problems after overdrive. So, i suppose, You will ad me to block list..but your amplifiers do not stop to blow.
"Do not confuse me with facts, I have already made my opinion"😛
Here is the Precision 1 schematic.
BD139 is working here with plus and minus 55 volts.
It is 80 volts by specifications..must turn your mind a little bit more flexible..this does not means with 81 volts it will burn...that is guaranteed voltage..of course, factory is not constituted by idiots, and the transistor, for safety reasons, can withstand much more voltage.
Same about condensers.
Eva is not rigth... even if technically she may have some reasons.... she is moved by bad feelings..and this is never rigth....also you do not know her...the lady.... ask her how many schematics and amplifiers, boards, follow ups, helping people, she did in this forum these last years...you will see how helpfull she is to forum folks.
Eva is a girl name.... everybody can choice names...my choice was destroyer because i used to burn transistors to learn something when very young...DIY since very young i was...... she can choice Eva because she is a girl or because other reason i cannot imagine... despite seems to be a gentle lady..from time to time seems to me to behave alike a Nazi second world war german....this confuses me a little.... as you can ...i can... entering forum, to choice the nickname as Angeline Jolie...interesting name (not reall the Jolie..has meaning in french..artistic name only)
About to install you in the ignore list...i think this is a very good idea, as i have found you not nice several times.
Will produce a video..showing an amplifier, using BD139/140 facing strong pulse of full power without burn (55V plus 55v), now ask Eva how many volts peak to peak from colector to emitter this may represent.
Supply has voltage drops..rail voltage regulators reduces voltage..also the Precision one is not using BD139 in dangerous areas..maybe that schematic was not the correct one...this is possible..we have made several versions while testing.
good bye,
Carlos
BD139 is working here with plus and minus 55 volts.
It is 80 volts by specifications..must turn your mind a little bit more flexible..this does not means with 81 volts it will burn...that is guaranteed voltage..of course, factory is not constituted by idiots, and the transistor, for safety reasons, can withstand much more voltage.
Same about condensers.
Eva is not rigth... even if technically she may have some reasons.... she is moved by bad feelings..and this is never rigth....also you do not know her...the lady.... ask her how many schematics and amplifiers, boards, follow ups, helping people, she did in this forum these last years...you will see how helpfull she is to forum folks.
Eva is a girl name.... everybody can choice names...my choice was destroyer because i used to burn transistors to learn something when very young...DIY since very young i was...... she can choice Eva because she is a girl or because other reason i cannot imagine... despite seems to be a gentle lady..from time to time seems to me to behave alike a Nazi second world war german....this confuses me a little.... as you can ...i can... entering forum, to choice the nickname as Angeline Jolie...interesting name (not reall the Jolie..has meaning in french..artistic name only)
About to install you in the ignore list...i think this is a very good idea, as i have found you not nice several times.
Will produce a video..showing an amplifier, using BD139/140 facing strong pulse of full power without burn (55V plus 55v), now ask Eva how many volts peak to peak from colector to emitter this may represent.
Supply has voltage drops..rail voltage regulators reduces voltage..also the Precision one is not using BD139 in dangerous areas..maybe that schematic was not the correct one...this is possible..we have made several versions while testing.
good bye,
Carlos
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BV did expose some points that deserve to be took into account.
The points mentionned may be non criticali most of
the time , but situations can occur where they start showing
their influence , and pushing an amp to his limits is generaly the
way to have these problems occuring.
Designing an amp mandate exploring the worst case situations..
The points mentionned may be non criticali most of
the time , but situations can occur where they start showing
their influence , and pushing an amp to his limits is generaly the
way to have these problems occuring.
Designing an amp mandate exploring the worst case situations..
Take a look at this boys.
I do not think, theories are better than reality...see what happens.
YouTube - Using BD139 - supply is 55V
YouTube - PC power on - pulse going to amplifier
YouTube - 55V, using BD139, PC power of pulse
There are no arguments against reality.... 15 plus 15 thousand microfarads in the supply.... almost 55 V...... where is the BD139 burned?
I am not designing anything..amplifier is ready to go...it is there to people build the most lovely wide world superb sound amplifier..i am ready to help them to build..will not discuss theories, i do not like, do not thing is helpfull, do not think is kind and will ignore theorists.
Will give special attention to builders, humble people that wants a good audio amplifier..about the others that wants fame..will be talking alone.
Purpose of www.diyaudio.com, solid state, is Do it Yourself..so..builders are fine!
purpose is not re-design other one's amplifiers
purpose is not criticise other one's amplifiers
purpose is not behave alike consultant when no one have asked anything about the stuff.
So, i strongly think and believe, the ones wants to be under the spot ligth, on the scene,on the stage, to be a movie star, or to be famous..do not count on me..my purpose here is to create,design, copy, produce, assemble, test, produce layout, board X ray view, to help builders, to give follow up..people that want to show themselves should try another thing, as to use watermellon around the neck that to cross the main street nude claiming loud, almost shouting their names to be known.
regards,
Carlos
I do not think, theories are better than reality...see what happens.
YouTube - Using BD139 - supply is 55V
YouTube - PC power on - pulse going to amplifier
YouTube - 55V, using BD139, PC power of pulse
There are no arguments against reality.... 15 plus 15 thousand microfarads in the supply.... almost 55 V...... where is the BD139 burned?
I am not designing anything..amplifier is ready to go...it is there to people build the most lovely wide world superb sound amplifier..i am ready to help them to build..will not discuss theories, i do not like, do not thing is helpfull, do not think is kind and will ignore theorists.
Will give special attention to builders, humble people that wants a good audio amplifier..about the others that wants fame..will be talking alone.
Purpose of www.diyaudio.com, solid state, is Do it Yourself..so..builders are fine!
purpose is not re-design other one's amplifiers
purpose is not criticise other one's amplifiers
purpose is not behave alike consultant when no one have asked anything about the stuff.
So, i strongly think and believe, the ones wants to be under the spot ligth, on the scene,on the stage, to be a movie star, or to be famous..do not count on me..my purpose here is to create,design, copy, produce, assemble, test, produce layout, board X ray view, to help builders, to give follow up..people that want to show themselves should try another thing, as to use watermellon around the neck that to cross the main street nude claiming loud, almost shouting their names to be known.
regards,
Carlos
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OK - crank it to full power with a test signal and put a screwdriver across the outputs as Phase Linear and Crown do. Show us how the fused protection actually works, and use the fuses that you suggest for a 4 ohm load. Do it at the highest rated ambient operating temperature. Be sure to take a video of it!
I only post here because I don't like to read **, and flawed reasoning.
I would like to know the amplifier the guy have designed, or built, or assembled, or
copied, recreated, cloned...i want to see pictures, schematics, general informations about, board layout, x ray vision and if the guy wants to help me to build his amplifier.also if he wants me to publish my review about or if he wants me to mail him my thougths or not.
What they think about my amplifiers..for sure i will ask them if i have that curiosity.
The value i use to give to a DIYer, depends how many amplifiers he designed, copied, built, recreated, cloned, adapted, make franksteins or other things alike..how many guys have assemble his amplifier..how many guys he helped, how many guys he have teached things.
Personally, i have no other way to evaluate...i would like to see proof the one did really amplifiers, to watch pictures about too..as some guys talk, talk, and do nothing!
I am in the correct place..my thread, the one i have opened..the correct forum..audio, solid state and Do It Yourself.
Others wants to change the forum direction or route..to me the forum is very good the way it was, the way it is and probably the way it gonna be.
If you wanna a suggestion forum folks, the moving, walking encyclopedias, the full time consultants not invited to suggest things, the theorists, the other one's design evaluators, the advisers and so on.... to try to do something usefull, to build something in the place to go giving suggestions no one have asked or to redesign other one's amplifiers, or to remember us datasheet containt when everybody can type the transistor name in google and read datasheet..so... not usefull thing...do something..be usefull..be helpfull... search for some young newcomers, novice, beginners and help them to learn things...be helpfull in the place to be buzzing around doing nothing.
regards,
Carlos
copied, recreated, cloned...i want to see pictures, schematics, general informations about, board layout, x ray vision and if the guy wants to help me to build his amplifier.also if he wants me to publish my review about or if he wants me to mail him my thougths or not.
What they think about my amplifiers..for sure i will ask them if i have that curiosity.
The value i use to give to a DIYer, depends how many amplifiers he designed, copied, built, recreated, cloned, adapted, make franksteins or other things alike..how many guys have assemble his amplifier..how many guys he helped, how many guys he have teached things.
Personally, i have no other way to evaluate...i would like to see proof the one did really amplifiers, to watch pictures about too..as some guys talk, talk, and do nothing!
I am in the correct place..my thread, the one i have opened..the correct forum..audio, solid state and Do It Yourself.
Others wants to change the forum direction or route..to me the forum is very good the way it was, the way it is and probably the way it gonna be.
If you wanna a suggestion forum folks, the moving, walking encyclopedias, the full time consultants not invited to suggest things, the theorists, the other one's design evaluators, the advisers and so on.... to try to do something usefull, to build something in the place to go giving suggestions no one have asked or to redesign other one's amplifiers, or to remember us datasheet containt when everybody can type the transistor name in google and read datasheet..so... not usefull thing...do something..be usefull..be helpfull... search for some young newcomers, novice, beginners and help them to learn things...be helpfull in the place to be buzzing around doing nothing.
regards,
Carlos
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Have you build something PB2....you are old in this forum
You should have a lot to offer us.
Do the test yourself as you may know a lot...be sure to make the video for us.
regards,
Carlos
You should have a lot to offer us.
Do the test yourself as you may know a lot...be sure to make the video for us.
regards,
Carlos
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Avoiding the suggested real world test? Throwing up a smoke screen with lots of rambling?
I built amplifiers like yours when I was 12 years old from scratch, including the chassis from sheet aluminum. Parts mostly from a local surplus house. I copied the Citation 12 circuit and later adapted the voltage regulator from the Dynaco ST120. That is an interesting regulator - it provides a negative source resistance up to the current limit. I've done a lot more since then!
I will leave now as you don't want to see the reality of your claims.
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I will build some of your amplifiers if you help me to select the good parts
Some of them i have already made...when i was a kid...others not.
Remember always to respect datasheet...it is precise and was made for you....other way the amplifier will smoke.
Thank you,
regards,
Carlos
Some of them i have already made...when i was a kid...others not.
Remember always to respect datasheet...it is precise and was made for you....other way the amplifier will smoke.
Thank you,
regards,
Carlos
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