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Apex A40 Amplifier Build Thread
Apex A40 Amplifier Build Thread
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Old 9th June 2019, 05:57 AM   #1
HatlessChimp is offline HatlessChimp
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Join Date: Feb 2016
Default Apex A40 Amplifier Build Thread

This is a dedicated thread to the Apex A40 Amplifier. Feel free to share your build and discuss and share information about the A40.
I will do my best to keep this 1st post updated with as much information as possible. I am still building this out, please be patient. If there are any errors please let me know!

The Project
The Apex A40 Amplifier was designed by Apex Audio and kindly shared to DiyAudio community. He has continually shared various designs, revisions and countless feedback over many years. All of his designs are popular and well endorsed by many experienced members in the DIYA Community. The original thread can be found here - 100W Ultimate Fidelity Amplifier - diyAudio

Schematic

Apex A40 Files
Gerbers, Mirrored PCB images, Photos, Schematic and Partial .txt BOM can be gound here - Apex A40 Amplifier Build Thread

a40%20pcb%20color.jpg

Bill of materials
Anyone with an up to date BOM for Digikey please contact me

Transistor Choices
2SA1943 – Toshiba, On Semiconductor - Transistors - Bipolar (BJT) - Single | Discrete Semiconductor Products | DigiKey
2SC5200 – Toshiba, On Semiconductor - Transistors - Bipolar (BJT) - Single | Discrete Semiconductor Products | DigiKey
MJL4281 - On Semiconductor - Transistors - Bipolar (BJT) - Single | Discrete Semiconductor Products | DigiKey
MJL4302 - On Semiconductor - Transistors - Bipolar (BJT) - Single | Discrete Semiconductor Products | DigiKey
NJW0281GOS-ND - On Semiconductor - https://www.digikey.in/products/en?keywords=NJW0281
NJW0302GOS-ND - On Semiconductor - https://www.digikey.in/products/en?keywords=NJW0302

Are my transistors a fake/copy thread - My Transistors, original or copy?

Power supplies

Construction tips
Please contact me with any tips you have to share.

Project modifications
Know of any proven mods? Please share them!


Recommended DIY Pre Amp
Apex P30

A40 Members and build photos
Please Share your builds!

JUST WAITING ON MODERATOR APPROVAL FOR UPLOADING MORE FILES TO THIS THREAD/POST.

Cheers!

Last edited by HatlessChimp; 9th June 2019 at 12:16 PM.
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Old 9th June 2019, 12:05 PM   #2
HatlessChimp is offline HatlessChimp
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Join Date: Feb 2016
APEX A40 FILES
Includes - Gerbers, Mirror PDF, Schematic, Top view.


APEX PROTECT FILES
Includes - Silkscreen, Mirror PDF, Sprint File.
Attached Images
File Type: jpg APEX A40 By ALEX MM rev1.4.jpg (759.6 KB, 1199 views)
Attached Files
File Type: zip APEX STEREO PROTECT FILES.zip (590.7 KB, 144 views)
File Type: pdf APEX A40 CFA ALL CRAY RED BLACK TOP VIEW By ALEX MM rev1.4.pdf (278.3 KB, 131 views)
File Type: pdf APEX A40 CFA BOTTOM MIRRORED By ALEX MM rev1.4.pdf (106.8 KB, 100 views)
File Type: zip APEX A40 PCB GERBERS By ALEX MM rev 1.4.zip (165.8 KB, 108 views)
File Type: txt 138 APEX A40 CFA By ALEX MM rev1.4.txt (2.8 KB, 86 views)

Last edited by HatlessChimp; 9th June 2019 at 12:18 PM.
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Old 9th June 2019, 12:10 PM   #3
HatlessChimp is offline HatlessChimp
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Join Date: Feb 2016
More APEX A40 FILES
These files I've listed as Version B only to help all the files from getting mixed up.
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Old 9th June 2019, 12:29 PM   #4
HatlessChimp is offline HatlessChimp
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UNCONFIRMED A40 FILES
These files I am unsure if they are usable. Would be nice if someone could please help me verify them and provide some information on them. Thanks!
Attached Images
File Type: jpg APEX A40 LIFTED GROUND (UNCONFIRMED).jpg (775.4 KB, 295 views)
Attached Files
File Type: pdf A40 CFA APEX ALL rev1.6 (UNCONFIRMED).pdf (290.8 KB, 84 views)
File Type: zip A40 Sprint File (UNCONFIRMED) .zip (111.3 KB, 66 views)
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Old 9th June 2019, 03:40 PM   #5
apexaudio is offline apexaudio  Serbia
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A40 video
YouTube
YouTube
YouTube
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Old 9th June 2019, 07:02 PM   #6
burnmaster is offline burnmaster  Bulgaria
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Join Date: Oct 2016
For my new A40 I use these final transistors.
By the way, the other day the one channel sounded great in a state of being.

Click the image to open in full size.


Click the image to open in full size.

And of me great thanks to Apex Audio for the excellent circuit.
Someone had said there was no perfect amplifier.)))))
This is not the case.
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Old 9th June 2019, 07:32 PM   #7
alex mm is offline alex mm  Romania
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Location: Baia Mare ,
Default A40 in progres

Hi all,
The latest revision of PCB Will be ready this summer .
BR Alex
Attached Images
File Type: jpg DSC04490-001.jpg (701.3 KB, 313 views)
File Type: jpg DSC04491-001.jpg (809.8 KB, 322 views)
File Type: jpg DSC04492-001.jpg (739.1 KB, 211 views)
File Type: jpg IMG_20180829_175409.jpg (1.01 MB, 205 views)
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CD player Onkyo C-N 7050 , Preamp's :Adagio tube
and Goldmund Mimesis 27 , Speakers :Taga Harmony Platinum F-120 Amp's: 2XGoldmund Mimesis9.2, A33, 2XGROMES A260 tube , SARA , QUAD 405-13
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Old 10th June 2019, 07:49 AM   #8
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by alex mm View Post
Hi all,
The latest revision of PCB Will be ready this summer .
BR Alex
Will be AF30 PCB?
Attached Images
File Type: jpg af30.jpg (583.5 KB, 357 views)
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Old 10th June 2019, 08:20 AM   #9
shahzad831 is offline shahzad831
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Join Date: Nov 2016
Hello every one
Is it possible to feed A40 with +/-75vdc? Output devices are sanken's a1216 c2922.
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Old 10th June 2019, 09:07 AM   #10
maxwell007 is offline maxwell007  Czech Republic
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Location: Prague
My build...
Attached Images
File Type: jpg 20190512_184700.jpg (788.9 KB, 382 views)
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