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Apex A40 Amplifier Build Thread
Apex A40 Amplifier Build Thread
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Old 10th June 2019, 06:00 PM   #21
burnmaster is offline burnmaster  Bulgaria
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Join Date: Oct 2016
Respect to alex mm and maxwell007.
You have built extremely beautiful devices.
Whatever I do, my devices look like they're made with an ax.)))))
And other times I've been showing my old A40, but in the spirit of the theme again.
YouTube

A40 became my favorite when I was in a direct match over my previous favorite .....
A40 sounds better.

YouTube

Last edited by burnmaster; 10th June 2019 at 06:03 PM.
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Old 12th June 2019, 10:40 PM   #22
rehman is offline rehman  Pakistan
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Quote:
Originally Posted by apexaudio View Post
Your option is A40, SR300, B500, HV23...
hi sir. i have build A40 a day ago and tested. there is an issue. the issue is with offset pot. when power supply is connected there are some voltage at output and offset pot does not do any thing to offset voltages. other than that two transistors MJE340 and 350 at input stage are heating up without any signal. pcb is my own designed.
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Old 13th June 2019, 02:00 AM   #23
asuslover is offline asuslover  Romania
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Join Date: Aug 2016
Location: USA
Apex A40 Amplifier Build Thread
I'm happy you started this thread.
These are some picture of the power transistors could be used for this amp.
Attached Images
File Type: jpg IMG_1163.jpg (1.05 MB, 188 views)
File Type: jpg IMG_1159.jpg (1.00 MB, 171 views)
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Old 13th June 2019, 07:40 AM   #24
shahzad831 is offline shahzad831
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Join Date: Nov 2016
Hi rehman
I would suggest u to check ur pcb. Yesterday i assembled A40 on alex's PCB , started at first tym. Mjes are in VAS get hot no problem with it. Just review ur pcb its better to use alex,s .
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Old 13th June 2019, 07:53 AM   #25
shahzad831 is offline shahzad831
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Join Date: Nov 2016
Hi rehman
I would suggest u to check ur pcb. Yesterday i assembled A40 on alex's PCB , started at first tym. Mjes are in VAS get hot no problem with it. Just review ur pcb its better to use alex,s .
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Old 13th June 2019, 08:28 AM   #26
rehman is offline rehman  Pakistan
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Join Date: Dec 2017
Quote:
Originally Posted by shahzad831 View Post
Hi rehman
I would suggest u to check ur pcb. Yesterday i assembled A40 on alex's PCB , started at first tym. Mjes are in VAS get hot no problem with it. Just review ur pcb its better to use alex,s .
thanks for reply. i have attached my pcb if you can look on it. if you have unmirrored black pcb layout of alex,s pcb then give me please. i realy want to build this amp.
Attached Images
File Type: png Capture.PNG (119.0 KB, 164 views)
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Old 13th June 2019, 10:03 AM   #27
rehman is offline rehman  Pakistan
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Join Date: Dec 2017
Quote:
Originally Posted by alex mm View Post
Hi all,
The latest revision of PCB Will be ready this summer .
BR Alex
hi alex. i have some issues with my pcb. i cant adjust offset with pot. is there should be 470k or 470R resistor and is it normal for mje340, 350 at input side to get hot even on low operating voltages ?.
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Old 13th June 2019, 05:00 PM   #28
rehman is offline rehman  Pakistan
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Quote:
Originally Posted by maxwell007 View Post
My build...
can you give me files please?
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Old 13th June 2019, 05:38 PM   #29
burnmaster is offline burnmaster  Bulgaria
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Join Date: Oct 2016
rehman.....I do not understand English well, but as far as I understand you have a problem with the scheme.
If the board is executed correctly, there should be no problem, and it works from the first time.
You have to be careful with the bindings and there is no shortage of tracks. It happened to me but I found it.
I would help with what I can, but the language is very disturbing to me.
Please someone help him urgently because this man deserves the A40.))))
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Old 13th June 2019, 06:31 PM   #30
rehman is offline rehman  Pakistan
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Join Date: Dec 2017
Quote:
Originally Posted by burnmaster View Post
rehman.....I do not understand English well, but as far as I understand you have a problem with the scheme.
If the board is executed correctly, there should be no problem, and it works from the first time.
You have to be careful with the bindings and there is no shortage of tracks. It happened to me but I found it.
I would help with what I can, but the language is very disturbing to me.
Please someone help him urgently because this man deserves the A40.))))
just one last question please someone solve my confusion. which of the following is 100% working and ok PCB??. which one should i made.?? should there be 470R or 470K resistor with offset pot?
Attached Files
File Type: pdf A40 CFA APEX ALL GREY.pdf (225.4 KB, 19 views)
File Type: pdf APEX A40 CFA ALL CRAY RED BLACK TOP VIEW By ALEX MM rev1.4.pdf (278.3 KB, 23 views)
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