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Old 17th June 2012, 06:55 AM   #1
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Default Dx Super A - a module to be coupled to Dx amplifiers

It can be used with other audio amplifiers that uses emitter follower and needs bias generated reference voltage from 2 to 2.4 volts Dc.

This circuit is adapted, or almost a copy, from the Super A used in the Braziian Gradiente factory (already closed.... factory not operating anymore)....it was used in one of the most famous models of this brand, called Model 366.... it was a license from JVC, the one have created the system down the seventies.

The Super A works setting a high level of bias (300 to 500mA) and switches this current to a lower value (Class AB) when the output power increases above some pre decided level (in our case 4 volts RMS aprox.) ... this way you have a couple of watts in Class A (non switching in the transistor crossover region) and does not have the heat that comes together a Class A amplifier.

This was tested in a Dx Blame ST amplifier, and i did it with one that had 20 plus 20 volts supplies...soon i will be testing together many other models from the "Dx Corporation - the audiophile union"

This circuit is in testing and may receive some modifications...and i will publish the revised schematics.

Here you have the video with the last test made with it:

Dx Blame ST, Super A approved! - YouTube

regards,

Carlos
Attached Images
File Type: jpg Module Super A adjusted to the Blame ST 20 plus 20 volts.jpg (502.3 KB, 768 views)
File Type: jpg Circuit to the Dx Amplifier, the Standard.jpg (199.9 KB, 706 views)
File Type: jpg Prototype board.JPG (166.6 KB, 657 views)
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Old 17th June 2012, 06:57 AM   #2
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Default Showing you the original Gradiente Model 366

Images attached.

regards,

Carlos
Attached Images
File Type: jpg DSC03244.jpg (300.4 KB, 613 views)
File Type: jpg DSC03249.jpg (242.6 KB, 575 views)
File Type: jpg Model 366.jpg (124.1 KB, 166 views)
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Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 17th June 2012, 07:00 AM   #3
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Default More images about the Gradiente Model 366 - the SuperA unit

This one is famous and audiophile goes to buy it and pay 500 bucks without discuss.

There's someone in the Brazilian free Market (Mercado Livre....alike Ebay) selling audio power pcboards for this model... a copy from the original Gradiente pcboard.

regards,

Carlos
Attached Images
File Type: jpg Gradiente 366 - c.jpg (282.5 KB, 150 views)
File Type: jpg Gradiente 366 -a.jpg (522.6 KB, 191 views)
File Type: jpg Super A from Gradiente.jpg (596.9 KB, 252 views)
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Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 17th June 2012, 07:02 AM   #4
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Default Here you have some diagrams...but this is a reference only

Values are being changed in order to adjust the unit to different demands and different power amplifiers.

Just publishing to show you some "standard" of values that may be a start up.

regards,

Carlos
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Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 17th June 2012, 07:03 AM   #5
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Default More images related the unit

attached,

regards,

Carlos
Attached Images
File Type: jpg Dx Blame ST will be tested together Dx Super A module.jpg (404.4 KB, 253 views)
File Type: jpg Dx Super A - 2.jpg (273.8 KB, 182 views)
File Type: jpg Dx Super A - 3.jpg (122.6 KB, 103 views)
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Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 17th June 2012, 07:06 AM   #6
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Default I have being working on that these last two weeks

And something was posted into the Dx amplfiers thread, also the Dx Blame ST thread and something was said in the Dx Blame MKIII Hx thread too....but just to inform, as i was not sure if i would like it or not.

Now we have a thread and all informs will be here.

I have perceived the sound muffled...but this may be my damaged tweeters..now i will evaluate better...give me a couple of days and i will say what i think about...for a while i am appreciating a lot the advantage not to have all that Class A heat and also the quality in very low levels (1 to 2 watts reproduction).

Well...we listen at this level almost 80 percent of our time.

regards,

Carlos
Attached Images
File Type: jpg New tweeters.jpg (551.8 KB, 130 views)
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Old 17th June 2012, 07:14 AM   #7
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Default I will post a list of videos made about the Dx Super A

This one was made in Portuguese to my people:

Dx Super A in Portuguese language - YouTube

And here you have other ones:

Dx Super A installed and first test done - YouTube

Super A was mufled because tweeter was damaged - YouTube

Dx Super A - 300mA in class A - Supply 40 + 40V - YouTube

Dx Blame MKIII Hx going original again - YouTube

Do not assemble Dx Super A for a while - YouTube

Dx Blame ST playing - it rocks! - YouTube

Dx Blame Rocks II - recorded using Kodak Playfull Ze1 - YouTube

Dx Blame ST - Break for lunch - YouTube

Here you have one of my cameras used to make these videos:

This is the Mitsuca! - YouTube

Pictures attached show the Kodak Playfull Ze1 and the Dx Blame MKIII Hx used together the Dx Super A module (first try)

regards,

Carlos
Attached Images
File Type: jpg Ze1 front.jpg (162.9 KB, 90 views)
File Type: jpg Ze1 display.jpg (166.3 KB, 28 views)
File Type: jpg Dx Blame MKIII Hx operating 42 volts.JPG (522.1 KB, 147 views)
__________________
Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 17th June 2012 at 07:20 AM.
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Old 17th June 2012, 07:45 AM   #8
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Default Procedures about how to install and adjustments will be provided soon

Sketches, texts and videos will be provided.

I will prepare the unit to operate with 35 plus 35 volts to the Dx Blame ST, then i will prepare it to the Dx Amplifier (Standard one) and will prepare it to Dx Blame MKIII Hx home editions (40 plus 40 volts supplies).

Brazilians wants a dedicated forum to my amplifiers...i may accept their offer.... i am thinking about.

regards,

Carlos
__________________
Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 17th June 2012, 08:38 AM   #9
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Default The idea about the Super A (from JVC) started May, 11th

Here you have videos about:

Dx Super A - starting to prepare the circuit board. - YouTube

Dx Super A prototype board - part B - YouTube

Dx Super A prototype board - part C - YouTube

It shows the way i produce my prototypes...this method i am using since 1960.... i do think it is SMD style.

regards,

Carlos
__________________
Dx Mark One - The lowest THD amplifier ever made! - LOADED
https://www.youtube.com/watch?v=OC3_AdPbLvc, Unbeatable Dx Mark One; https://www.youtube.com/watch?v=u4tGBiqMnzQ
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Old 17th June 2012, 01:25 PM   #10
Bigun is offline Bigun  Canada
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I like the use of the cpu cooler, very compact and efficient - and these days they are whisper quiet.
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