Dx Blame ST, operating from 18 to 24 Volts (unloaded) - Class A - diyAudio
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Old 15th April 2010, 08:18 AM   #1
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Default Dx Blame ST, operating from 18 to 24 Volts (unloaded) - Class A

You know, as i have commented i do not like Class A, my environement, climate, weather, temperature, is too much hot to use class a...also i already have oven to cook food.

They compress, they kill treble, they distort in a very ugly way (awfull clipping), they are very weak in power, waste a lot of energy..well...it is impossible to me to accept that...i do not feel confortable, also i do not feel myself as an inteligent man using these amplifiers.

Despite of that, i know people loves, also they do not distort, crossover
distortion is almost zero, and this turns the sound interesting.

I very good and old friend from Croatia has asked me..them i have prepared..but no way to me to build..for sure will work...as there's no reason to fail..circuit is clear, simulation shows enormous stability and very low distortion..lower than others.

It may be even better than the Dx Blame ST..for the ones loves low power and high heat.

regards,

Carlos
Attached Images
File Type: jpg Blame Croatia - 24V.jpg (385.8 KB, 684 views)
File Type: jpg Dx Blame Croatia - AC analisis.jpg (77.7 KB, 603 views)
Attached Files
File Type: pdf Dx Blame Croatia - 18 to 24V - Class A.pdf (72.7 KB, 185 views)
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Old 15th April 2010, 08:24 AM   #2
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Default Will i build this one to test?....no way!

But it may be one of the best audio amplifiers ever made.

Board is the same board used in Dx Blame ES and Dx Blame ST.... details and layout in Greg home pages, and adjust stand by current to 1.2 A each rail:

Made for 8 ohms speaker..wanna use lower impedance?, then will have to re adjust, increasing the stand by current (my god!..heat!)

Greg's Web Site

regards,

Carlos
Attached Images
File Type: jpg Dx Blame Croatia schematic.jpg (313.6 KB, 623 views)
File Type: jpg Dx Blame Croatia, 18V simulation.jpg (370.2 KB, 568 views)
File Type: jpg Dx Blame Croatia - Fourier analisis chart.jpg (201.8 KB, 487 views)
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Old 15th April 2010, 08:27 AM   #3
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Default It is very possible the Croatian friend will assemble..then he will post review

He is skilled..an engineer, a special one...that kind of engineers that assemble things, that test and compare...the one travells to go to all high end demonstration of audio equipment, the one loves Bora amplifiers and Aksa amplifiers (me too!).... he use to build tube amplifiers..... the one knows... deeply knowledge.

Also, his constrution is much better than others (several) can do.

Let's see if he will manage to build... the guy is good...very, very good!

His town is Osijek, in Croatia.

regards,

Carlos
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Last edited by destroyer X; 15th April 2010 at 08:31 AM.
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Old 15th April 2010, 08:53 AM   #4
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Default Take a good look at the distortion and harmonic distribution

compare with the best operational amplifiers and you will see the entire amplifier distorting 2.78 times less than some chips (the good ones)....also, it is 29 times less distorted compared to the Dx Amplifier, mine standard one.

Compare the specification with the competition and you gonna see this one comes to desintegrate, to vaporize the competition.

regards,

Carlos
Attached Images
File Type: jpg THD distortion.jpg (56.8 KB, 76 views)
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Old 15th April 2010, 10:39 AM   #5
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Default Some tips and tricks

Basic things to inform you.

regards,

Carlos
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Old 15th April 2010, 05:59 PM   #6
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Default If you have a 24 to 32 volts, symetrical supply, then you can use this

voltage regulator (Ampex and Sony - 1975).

It has capacitance multiplier, that 470uf appear in the output, to each rail output, alike a virtual capacitor.... the value of this virtual filtering is around
500.000uF to each rail...this slows down the circuit...so, to use together an AB amplifier, the ones has enormous variation of current, then remove this big condenser and replace it by a 4.7uf or something alike.

This was made, customized, to my Croatian friend...as he has a 24 volts huge symetrical power supply...this way he can have a laboratory supply, and will be able to adjust from 4.7 volts each rail up to the supply rectified voltage.

Stabilization is around 5 percent or less..sometimes you can have 1 percent..depends the voltage adjusted..to 12 volts adjusted you gonna have 1 percent..adjusting to 18 volts, then you gonna have 5 percent.

transistors can be the ones you want..they must face the voltage, and the series pass must face the current you gonna "suck" or drain from this supply.

It is adjustable, it is stabilized, the filtering is awsome, the ripple is very small.

Can be used, was made, re calculated, customized, to my Croatian friend, to use together this Class A audio amplifier.

regards,

Carlos
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Old 27th April 2010, 05:41 AM   #7
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Carlos - as you know - i am building it slowly...
more pictures and details are on this page:
- Blame ST amplifier - class A version (Pulse.Audio.Team)

it will be entirely made from my junk box from what i have ... will not be preety but hopefully it will sound very very good.....
thanks btw. for your modification of the original amplifier that fits into what i have (transformer)...
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Old 27th April 2010, 05:52 AM   #8
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Default You are very welcome....you producing my amplifier honors me

Your evaluation is precious.

regards,

Carlos
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Old 27th April 2010, 06:14 AM   #9
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Default Dx amplifiers, home made, DIY amplifiers, tuned for you!

build amplifiers folks!

Let us see your amplifier pictures.

regards,

Carlos
Attached Images
File Type: jpg Build an amplifier.jpg (176.3 KB, 280 views)
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Old 27th April 2010, 06:24 AM   #10
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don't worry - work is slow (family is taking it's time) but it will be done... :P
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