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Old 9th May 2012, 11:25 AM   #7031
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But one is correct, Andrew...class A+...
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Old 9th May 2012, 11:37 AM   #7032
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Default Yes....but works great...and as always, we have some power under

Class A biasing...or high bias class AB..well.... you understood.

Let's go doing it Epupa?

Dear Hugh...i am winning some challenges from my life..one was to return to audio...other was the lost of 70 kilos, two surgeries, one bariatric and other plastic and now a days working for the Government.... a whole life work...employee of the government because of tests applied and first place competing with 56 thousand folks....now accepting that wife does not love me anymore..when doing it, then she decide that love me too....ahahahahahah!.... crazy world!

making the prototype to the unknow amplifier class.... it is A, AB, maybe B or maybe XYZPTO:

http://www.youtube.com/my_videos?feature=mhee

regards,

Carlos
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Last edited by destroyer X; 9th May 2012 at 11:42 AM.
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Old 9th May 2012, 11:54 AM   #7033
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Class A+ isn't simply, Carlos...but I like complicated circuits, sometime I will try it...Best regards, Carlos...
Pavel
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Old 9th May 2012, 12:04 PM   #7034
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Default Yep.... i know very little about it...as i told, i do not appreciate hot appliances

my place is hot...too much hot to have something overheating my home.

I need some help to understand the stuff..... i will search for informs in Nelson Pass pages.

This was made by JVC...i am not creating anything new...this is very old...more than 40 years old i think....well... i am old too...now 61....that matches!

hehehhe

Carlos
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Old 9th May 2012, 12:21 PM   #7035
AndrewT is offline AndrewT  Scotland
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Upupa, thanks for the reminder.
I had a look at GK's implementation a few years back and had not appreciated the operation was true ClassA in that "Technics A+" topology. I will have to go back and read the Threads again.
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Old 9th May 2012, 12:43 PM   #7036
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Carlos, look at US Patent 1 401 951: Susumu Tanaka Bias circuit for use in a single ended pash-pull circuit...
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Old 9th May 2012, 12:47 PM   #7037
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Good to see you back, Carlos! I hope you recover quickly and will continue to inspire those in need of inspiration inside this wonderful DIY arena.

Best wishes,

Steve
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Old 9th May 2012, 03:13 PM   #7038
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Default Thank you Epupa and also thanks to Current flow

Herman has sent me files...very kind from you Herman.

I know the real thing from JVC is much more complicated, improved and detailed....i do like the simple way Brazilian Gradiente did a few decades ago.

Here you see the schematic.

There's a thread about Super A in our forum, and there we have several schematics to see.

I am posting the one from Gradiente that was a very sucessfull unit down here...tilll our days this equipment is sold by a very high price to audio fanatics because of sonic performance.

This schematic was sent to our forum friend, Jan Dupont from Denmark few years ago... and from time to time i have posted some comments about it as i deeply appreciate the sonics of these units... originally JVC and adapted to the "brazilian taste".

This amplifier was produced in Brazil 35 years ago.

regards,

Carlos
Attached Images
File Type: jpg Gradiente 366 -a.jpg (522.6 KB, 362 views)
File Type: jpg Gradiente 366 - b.jpg (88.0 KB, 332 views)
Attached Files
File Type: pdf Gradiente-Super-A-series-pwr-sch (2).pdf (114.8 KB, 106 views)
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Last edited by destroyer X; 9th May 2012 at 03:19 PM.
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Old 9th May 2012, 03:26 PM   #7039
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Default This Gradiente is deeply famous.... i have a sister in Brasilia

that has one.... looks new..works great till today....it is connected to giant speakers from Sony (Sigma 15) and from Gradiente (Master 200)... sounds good.... a little bit warm sonics.... a little bit muffled in the high end as usual in class A (i do feel this way...my point of view).

Last year i could see someone selling copies from the original pcboards from this Gradiente to the ones had the intention to fix old sets... Gradiente is broken and shut it's doors several years ago..no more Gradiente here in Brazil.

These boards was found to be sold in the Brazilian free market (Mercado livre)..something alike Ebay...and last year the guy was there selling.... a fanatic about the brand.

regards,

Carlos
Attached Images
File Type: jpg trilhas_inclinada.jpg (112.6 KB, 317 views)
File Type: jpg pci_montada_cima.jpg (128.5 KB, 313 views)
File Type: jpg 4_kit.jpg (133.2 KB, 311 views)
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Old 9th May 2012, 03:32 PM   #7040
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Default Very nice.... a friend called Herman sent me these files

Great..... a very nice cooperation..... very good Herman.

Thank you.

regards,

Carlos
Attached Files
File Type: pdf SUPER A DX AMP_TOP VIEW_NAMES 1.pdf (16.1 KB, 164 views)
File Type: pdf SUPER A DX AMP_TOP VIEW.pdf (18.3 KB, 128 views)
File Type: pdf SUPER A DX AMP SCHEMATIC.pdf (11.3 KB, 183 views)
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