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Old 19th January 2013, 06:47 PM   #461
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I have made the drill today, and it was not easy to keep alignment so I did the best I can, I have found a bottle of "chingiling" thermal white paste just enough to apply to the heat sink insulators, maybe today I might be able to bias it, if all goes smoothly , also I have to replace those resistors with the correct size one now that I have them on hand, and yes mister Carlos, I still have that Toshiba from my friend he didn't pick up up yet, but is a vintage amplifier, but it can not get even close to Dx Super A sound quality, and Super A has even more power than the Toshiba SC-665, sorry that is my opinion, oh sorry again damn! , about the resistors here are the images so you know what I mean about replace those blue color resistor for the brown ones.

Regard
Juan
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File Type: jpg 1.jpg (944.6 KB, 307 views)
File Type: jpg 2.jpg (898.9 KB, 269 views)
File Type: jpg 3.jpg (336.9 KB, 240 views)
File Type: jpg 4.jpg (964.9 KB, 233 views)
File Type: jpg 5.jpg (911.7 KB, 59 views)
File Type: jpg 6.jpg (338.5 KB, 54 views)

Last edited by vargasmongo3435; 19th January 2013 at 07:16 PM. Reason: missing files
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Old 19th January 2013, 07:33 PM   #462
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Quote:
Originally Posted by wiljj78 View Post
That’s lovely stuff Juan looking very good, hopefully next month I can taste how delicious the Stereo of Super A, But I will just use 1943/5200 these are the available power transistor in my place, hope I can get the same power in 4 Ohms.

Regards,
Willy

Hey my man!

hey bro, make sure that all jumpers are in place double... triple ...check all and make sure the trim pot is on the highest resistance about 190 ohms power supply about 43V apply power and slowly begin to adjust until close to 2V then wait, for thermal heat sink to stabilize, then get it where you see about 2.48V is 2.5V but for now wait 5 minutes, then wait even more about 15 to 20 minutes... then you can adjust till you get about 2.5V maybe not all multimeter work the same so yeah about 2.5V or close. that is the way I did it maybe you are more advance than me so it will be easy for you. just to add a quick note: " this is the way I did".

Regards
Juan
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Old 19th January 2013, 08:08 PM   #463
wiljj78 is offline wiljj78  Philippines
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Quote:
Originally Posted by vargasmongo3435 View Post
Hey my man!

hey bro, make sure that all jumpers are in place double... triple ...check all and make sure the trim pot is on the highest resistance about 190 ohms power supply about 43V apply power and slowly begin to adjust until close to 2V then wait, for thermal heat sink to stabilize, then get it where you see about 2.48V is 2.5V but for now wait 5 minutes, then wait even more about 15 to 20 minutes... then you can adjust till you get about 2.5V maybe not all multimeter work the same so yeah about 2.5V or close. that is the way I did it maybe you are more advance than me so it will be easy for you. just to add a quick note: " this is the way I did".

Regards
Juan
Thank you very much bro, these information is very valuable for me, I will follow these steps and let you know the outcome, but the only concern I have right now is the multi turn trimmer, this particular trimmer is not available locally that’s why I want to ask uncle Charlie about the layout file, this way I can customize the parts I have on hand otherwise very difficult bro.

Uncle Charlie I need the layout file of these Super A please……… Thanks in advance for your help…

Regards,
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Old 19th January 2013, 08:16 PM   #464
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Default Gerbers will not be provided...layout was already published

And Juan is the guy can give you these black and white images.

regards,

Carlos
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Old 19th January 2013, 08:37 PM   #465
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Default It is late here..... i want you to know that Zeraphine assembled the Dx Super A

Also i have made a video showing the supply pcboard prepare:

Preparing Dx Supply pcboards at home - YouTube

regards,

Carlos
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File Type: jpg Zeraphine 2.jpg (651.3 KB, 101 views)
File Type: jpg Brand new fresh picture..today's image..JPG (655.8 KB, 75 views)
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Old 20th January 2013, 07:02 AM   #466
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Default This enclosure have Dx Blame ST already modified to Super A

But these boards will be removed, a Dx supply will be inside (stabilized) and two Dx Super A pcboards will be in place too.

I am just waiting my boards to arrive to make it.

I will also receive dual coil super speakers... will be a paradise this home!

By Lira - speakers to the Dx Corporation - YouTube

Dx Symetrical, stabilized and adjustable power supply - YouTube

Here you have the Dx Supply thread...was moved, i made a mistake to post it separated and moderator sent the thread to the Supply thread...my mistake, this is a Dx Super A accessory, works together and should be inside this same thread....not it is too late..here you have the link:

Dx Supply, output adjustable, stabilized power supply

regards,

Carlos
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Last edited by destroyer X; 20th January 2013 at 07:08 AM.
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Old 21st January 2013, 03:12 PM   #467
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Yesterday I completed the other board, now I have to adjust the bias today and soon I will have stereo. looks really nice.


Regards
Juan
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Old 21st January 2013, 04:08 PM   #468
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Default Try the Dx Supply after you finish the adjustments.

before you install inside the enclosure.... i do have strong suspections you will love the regulator and will prefere it compared with your supply.... the sound result you can feel....bass is more pure, has no noise from the mains mixed with low tone bass.

When you drain huge current (4 ohms and full power as an example), then noises from the mains will appear into your positive and negative supply lines... this noises will go together your audio...so, your low frequency will be mixed with 60 hertz from the mains...will not be pure.... when you beat two tones..let's say 30 hertz together 60 hertz, you gonna have 30 hertz into your speaker, also you gonna have small volume of 60 hertz... even a smaller volume of 90 hertz and harmonics of these tones too... a big mess...this happens full power only.... a dirt bass tone.

It would happens with mids and treble too if these tones where not so small compared to the bass tones that represents almost 60 percent of the entire musical spectrum...so...bass will suffer...mids and highs maybe not

You are someone that loves bass...so...make it pure to your ears..... assemble the Dx Supply and put it into work for you..... you can use any series pass regulator that uses capacitance multiplier..not only Dx Supply, there are many models available...use one of them.

You do not need special transformers...you can use the voltage available.... just adjust the supply to a maximum of 4 volts less the transformer voltage without load... the voltage is not important..what is important is the transformer power.... and even this subject you can control using 8 ohms instead of 6 ohms, instead of 4 ohms and instead of 2 ohms.

Believe in your friend... results much better...if you have doubts i can make a video with and without the regulator and you will listen the mess when we drain full power from the supply/amplifier.

In your case...maybe not that noise..because you are using an expensive and huge bank of electrolitic capacitors..but this is (was) expensive.... these capacitor you have are enougth for you to assemble 3 Dx Supply regulators, to feed 3 stereo power amplifiers..naturally you will need transistors too... maybe the cost will not reduce..but for sure the performance gonna be better.

If you do not intend to use full power... pumping bass into your speakers till your windows shake..then you will not need such kind of supply...but i really doubt you will not cranck the volume all the way up.

regards,

Carlos
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File Type: jpg Dx Supply - b.jpg (320.5 KB, 108 views)
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Last edited by destroyer X; 21st January 2013 at 04:22 PM.
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Old 22nd January 2013, 07:07 AM   #469
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Quote:
Originally Posted by vargasmongo3435 View Post
Yesterday I completed the other board, now I have to adjust the bias today and soon I will have stereo. looks really nice.


Regards
Juan
Great job Juan!!! Congrats.....

Please elaborate further the Stereo Super A.

Uncle Charlie is this Regulated PSU intended for Stereo? i mean if the transformer capacity is 52VACx2/1200VA?

regards,

Last edited by wiljj78; 22nd January 2013 at 07:09 AM.
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Old 22nd January 2013, 12:20 PM   #470
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Default WilJJ78, your case is a little bit complicated.

I will post the answer here and also will post this stuff in the Dx Supply thread that was moved (sadly because it is to be used together this amplifier)...i have made a mistake....the good idea was to publish inside this same thread because it is an accessorie to the Dx Super A.

Dx Supply was made for our friends to save money because electrolitic condensers are very expensive.... It also provides yout stable output voltage and this helps you to achieve the low levels of distortion published.

It was made to receive maximum of 60 plus 60 volts DC and this comes from a 42 plus 42 volts alternated transformer... the maximum power to be drained, under these voltages, is 180 plus 180 watts, and this represents 360 total watts.

So, it was made for you to adjust 42 plus 42 volts into the output...this is the correct voltage to feed the Dx Super A amplifier.

Observe Dx Super A power specifications (42 plus 42 volts), results from the simulator with the supply voltage stable (regulated, stabilized at 42+42)

- 85 Watts RMS at 8 ohms, THD 0.001%, 1.5A plus 1.5A of current drain, that represents a power consumption of 63 watts plus 63 watts (63 watts per rail) and the total of 126W (efficiency is around 67% to 8 ohms).... rail fuses should be slow blow, 1.5A plus 1.5A or a little bit more if you like to enter clipping... speaker series fuse is 3A or a little bit more if you intend to enter clipping.

- 160 Watts RMS at 4 ohms, THD 0.002%, with 3A plus 3A of current drain, that represents a power consumption of 126 + 126W, or total of 254W... rails fuses should be 3A or more, all them slow blow... speaker fuse 6A or more...also slow blow.

- 250 Watts RMS at 2 ohms, THD 0.005%, with 5A + 5A of current drain, that represents a power consumption of 210 + 210W, or a total of 420 Watts of total power consumption.... 5A plus 5A slow blow fuses to the rails and 10A series fuse in series with the speakers (slow blow)

But, if you accept some distortion (we all accept..if we do not accept, the amplifier clips anyway and sometimes we do not perceive so fast it is)...then it can go to:

290 Watts RMS - 2 ohms - 1 percent distortion
330 Watts RMS - 2 ohms - 5 percent distortion
360 Watts RMS - 2 ohms - 10 percent distortion

10% distortion is not that crazy as you think, because some manufacturers (respectable ones) publish integrated circuit distortion at this level of distortion to increase the numbers...watch manufacturer datasheedt about them.

360 Watts RMS is the worst case scenario.... where the supply will face the maximum consumption resulted from the Dx Super A operation at 2 ohms and with 10 percent of distortion... here the current drain goes to 6.3A each rail ... and the consumption is 530 watts to a single channel.

The Dx Supply is good to feed two channels operating simultaneously, at 8 ohms and full power.

The Dx Supply can to feed one channel if you operate at 4 ohms, so, under this sittuation you will need two supplies, one to each channel.

The Dx Supply will need an extra pair of transistors to operate safe if you feed one channel at 2 ohms and drive it to full power (distorted)... you should check your rectifier rating and electrolitic condenser values because the supply was made, mainly, to feed two channels at 8 ohms.... two pair of transistors was the choice to save money into this supply.... so... you gonna need to tweak if you decide to push the limits into 2 ohms loads.... one of the main need is the extra pair of series power transistor...so... as a result, you gonna have three ouput pairs.

To be continued.....

regards,

Carlos
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