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Old 30th October 2012, 01:28 PM   #91
AndrewT is offline AndrewT  Scotland
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5th and 7th are way higher !
These are the ones that get most flack from our knowledgeable Members.
Any idea how big the 9th is?
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Old 30th October 2012, 05:43 PM   #92
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Default Homemodder, here is the transistor

picture attached.

regards,

Carlos
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File Type: jpg BD139.jpg (773.7 KB, 530 views)
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Old 30th October 2012, 08:47 PM   #93
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Default I found a wrong resistor value...this was the reason i had

strange current in the VAS... i also have tried some more modifications but these ones not approved for a while... i feel reduction in sensitivitand lifeless reproduction....so, tomorrow will return to the previous schematic...this new i have made (not published) was good in numbers..but related performance....not that good.

regards,

Carlos
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Old 30th October 2012, 11:54 PM   #94
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Default Listen to the quality

Dx Super A - MKII - good sound with poor speaker - YouTube

regards,

Carlos
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Old 31st October 2012, 11:48 AM   #95
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Default I am still making some researches.... trying to make it even better

related harmonic distribution, i am assembling and listening and trying new things.

Sadly i have reduced quality in my last move... despite simulator said would be much better, resuted very poor in sound, no transparent, without focus, lifeless and with small dinamics.

I am reverting all i have done to start all over again from the previous approved schematic.

Listen the recording you have, as a link, in the signature line...you see there's no bright in the trebles, and sound is compressed....was made after the last tweaks... despite the recording quality is much better as i have made a lot of modifications and have used pillows, matresses and all kind of reflection dampers, the sound is less good than the previous schematic (the last one posted)

Some pictures made, from the Dx Blame ST board modified, used as base to the prototype tweakings, i will post them all late as i am in my job using my 15 minutes of morning rest.

regards,

Carlos
Attached Images
File Type: jpg DxSA-17.jpg (537.7 KB, 451 views)
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Old 31st October 2012, 06:33 PM   #96
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Default I am working..soon you will have some news

Working in the Dx Super A.

http://www.youtube.com/watch?v=4PVEVFRjZ4s

regards,

Carlos
Attached Images
File Type: jpg I am working.jpg (182.1 KB, 372 views)
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Last edited by destroyer X; 31st October 2012 at 06:36 PM.
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Old 31st October 2012, 11:23 PM   #97
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Default I will show you some pictures, despite the amplifier does not look this way anymore

I have used the Dx Blame ST pcboards because Brazilians have complained..they said:

You told the Dx Blame ST was the best wide world ever made audio amplifier and now you say it is junk when compared to the Dx Super A because the Dx Super A is the ultimate wide world best ever made power audio amplifier.

Hehehehe...they are right to complain and i decided to study the way to assemble the Dx Super A into the Dx Blame ST pcboards to be forgiven.

This way i am buiding and tweaking the prototype in the Blame ST board.

I have tried the MJE15030 and MJE15031 and no good result... now i am using BD139/140 back again into their driver position.

I am trying 2N5551 as first VAS...but i could not decide yet.

Well... several changes being made...will show you pictures, despite it is not this way anymore.

regards,

Carlos
Attached Images
File Type: jpg Dx SA-1.jpg (925.2 KB, 357 views)
File Type: jpg Dx SA-2.jpg (559.6 KB, 318 views)
File Type: jpg DxSA-3.jpg (619.1 KB, 82 views)
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Old 31st October 2012, 11:25 PM   #98
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Default Yes, there's a hole into the board....as i told you, this is alike a scratch

a prototype, not made to be pretty, made to replace parts and to destroy the copper tracks soldering and dessoldering.

regards,

Carlos
Attached Images
File Type: jpg DxSA-4.jpg (596.0 KB, 101 views)
File Type: jpg DxSA-5.jpg (325.1 KB, 67 views)
File Type: jpg DxSA-6.jpg (590.3 KB, 71 views)
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Old 31st October 2012, 11:26 PM   #99
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Default You know, i have organized and now a days it is much better

Here you have some more pictures....i have made several because i know you like pictures.

regards,

Carlos
Attached Images
File Type: jpg DxSA-7.jpg (735.9 KB, 75 views)
File Type: jpg DxSA-8.jpg (648.5 KB, 42 views)
File Type: jpg DxSA-9.jpg (515.2 KB, 49 views)
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Old 31st October 2012, 11:28 PM   #100
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Default I hope you like them

I have made it downtown... in my Government Job.

regards,

Carlos
Attached Images
File Type: jpg DxSA-10.jpg (449.5 KB, 56 views)
File Type: jpg DxSA-11.jpg (483.6 KB, 45 views)
File Type: jpg DxSA-12.jpg (77.3 KB, 48 views)
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