100W Ultimate Fidelity Amplifier

[apexaudio]

mr.mile.
current measurement is 21.9 mV at R0.22. but not constant...the size heatsink is 20cm x 8cm for tes only.
View attachment 420880 View attachment 420881 View attachment 420882

Bias current is to high over 120mA, set 8mV at 0R22, and use proper heatsink.

 

[panggih]

Bias current is to high over 120mA, set 8mV at 0R22, and use proper heatsink.

Thank Mr.mile for quick response..
can i use this scheme for set bias?

 

[apexaudio]

Thank Mr.mile for quick response..
can i use this scheme for set bias?
View attachment 420933

Yes, but use 4k7 trimpot instead 2k2.

 

[panggih]

ok this morning i will try use this scheme and replace 2k2 with 4k7 trimpot..
thank a lot Mr.Mile

 

[cook77]

ok this morning i will try use this scheme and replace 2k2 with 4k7 trimpot..
thank a lot Mr.Mile

I tried pcb green.(cloned.).You will find it if you search for " apex ax11 " ...
Sound is ok for its simplicity. Mine (pcb-s) are 50X60mm each one.
Pre-finals transistors are only warm -no heatsink on. Just tested it today.

 

[panggih]

I tried pcb green.(cloned.).You will find it if you search for " apex ax11 " ...
Sound is ok for its simplicity. Mine (pcb-s) are 50X60mm each one.
Pre-finals transistors are only warm -no heatsink on. Just tested it today.

nice pcb frend,thanks for sharing

 

[panggih]

Bias current is to high over 120mA, set 8mV at 0R22, and use proper heatsink.

Hi,Mr.Mile

thanks a lot,i tested to put R 4k7 + 1k trimpot and now i can set bias to 8mV,and now transistor warm only.
thanks a lot

 

[apexaudio]

I tried pcb green.(cloned.).You will find it if you search for " apex ax11 " ...
Sound is ok for its simplicity. Mine (pcb-s) are 50X60mm each one.
Pre-finals transistors are only warm -no heatsink on. Just tested it today.

Nice work,
Regards

 

[apexaudio]

Hi,Mr.Mile

thanks a lot,i tested to put R 4k7 + 1k trimpot and now i can set bias to 8mV,and now transistor warm only.
thanks a lot

What about sound?

 

[Mihkus]

I yet havent found out why people print or write on the top layer when you can watch the picture...

 

[panggih]

What about sound?

this is a nice amp,deep and powerful bass, middle and high detail, I really like this amp.
thanks Mr.Mile

 

[masood]

this is a nice amp,deep and powerful bass, middle and high detail, I really like this amp.
thanks Mr.Mile

100w in 8 ohm really,thanks mr.mile

 

[Axwell]

what performance reaches the apex AX-14 when running +-41V
Especially for impedance 4 and 8 ohm write me, thank you.

What quiescent current, trimmer I set?

 

[wiljj78]

Been burning this amp for how many months but never surrender....
Very satisfying Amp....

 

[DAMANHURI]

Been burning this amp for how many months but never surrender....
Very satisfying Amp....

Nice PCB

my Question : The AX14 whether or HX11?

 

[wiljj78]

Nice PCB

my Question : The AX14 whether or HX11?

Thanks... above photos are AX-16, But this green PCB is AX-14.

 

[apexaudio]

Been burning this amp for how many months but never surrender....
Very satisfying Amp....

Nice work,
Regards

 

[sanbadgujar]

I tried pcb green.(cloned.).You will find it if you search for " apex ax11 " ...
Sound is ok for its simplicity. Mine (pcb-s) are 50X60mm each one.
Pre-finals transistors are only warm -no heatsink on. Just tested it today.

HI Cook77

for PCB layout which software are you used. I am using sprint layout but some component not macing please help me. and how to print exact size on A4 page because my layout output is bit small after print.

 

[cook77]

HI Cook77

for PCB layout which software are you used. I am using sprint layout but some component not macing please help me. and how to print exact size on A4 page because my layout output is bit small after print.

This one is meant to be for tests, so I used a permanent marker. The most of my pcb are made like that. Lately I made some by p&p method. Just measure some transistors size and match it in the picture of the pcb . If it fits, than that is the size of the pcb....

 

[masood]

Nice work,
Regards

dear apex
i just have build amplifier ax14 plz. tell me how can i prepare psu i only have four capacitor 4700/63volts.