100W Ultimate Fidelity Amplifier

[olafk]

A23

First try beginning with the input stage...
The sound from A17 is so impressive that I could not do otherwise than start the next test .
But need some more time.

regards Olaf

 

[apexaudio]

First try beginning with the input stage...
The sound from A17 is so impressive that I could not do otherwise than start the next test .
But need some more time.

regards Olaf

Olaf try A9 first...
Use A23 schematic from post #3558
Regards

 

[olafk]

Olaf try A9 first...
Use A23 schematic from post #3558
Regards

That was anyway on my list .
I will try both.

regards Olaf

 

[3388ton]

https://th-th.facebook.com/pages/วังของเก่า/133628703514914
next test

 

[3388ton]

Amp Circuit I know you apexaudio
suggestions

 

[apexaudio]

That was anyway on my list .
I will try both.

regards Olaf

Thank you,
Regards

 

[SoundsGreat]

Hi,

Btw in your views,which sounds better the 5200 version or 15003 ??

Regarding the Transformer,is 45-0-45V 5A (450VA) will do or should I go for 8A (720VA) ?? I need order them so asking,I want the best and Optimal so kindly suggest the same.

Also what bout the Slew rate of this ?? and Max Current ( for transient loads) ?

Regards

Any reply to this ??? Please do reply,Also whats the best way to set the bias ?

Regards.

 

[apexaudio]

Hi,



Any reply to this ??? Please do reply,Also whats the best way to set the bias ?

Regards.

Use MJ15003/4 with 720VA transformer,
Regards

 

[apexaudio]

Amp Circuit I know you apexaudio
suggestions

Wrong schematic.

 

[apexaudio]

A9 pcb

 

[SoundsGreat]

Hi,

Use MJ15003/4 with 720VA transformer,
Regards

Thank you Mr.Mile ! What bout the Bias ? Whats the best Bias value to be set ??? Can I bias it bit high to get a class A like characteristics (for the first few watts ) ??

Regards.

 

[apexaudio]

Hi,



Thank you Mr.Mile ! What bout the Bias ? Whats the best Bias value to be set ??? Can I bias it bit high to get a class A like characteristics (for the first few watts ) ??

Regards.

Start with 30mA...

 

[44250]

a lot of help from Olaf´s earlier works and this is what i draw,it should be checked and compared with schematics:

 

[apexaudio]

a lot of help from Olaf´s earlier works and this is what i draw,it should be checked and compared with schematics:

Nice work, but there is mistakes on your pcb...
Regards

 

[44250]

ok thanks,i will try to locate and correct them.

 

[44250]

here it is... : if someone else finds anythig more please let me know...

 

[apexaudio]

here it is... : if someone else finds anythig more please let me know...

Nice work, you can add zobel network (4R7, 100nF) on pcb,
Regards

 

[olafk]

here it is... : if someone else finds anythig more please let me know...

Much success with the A23, great layout - I'm very curious about the sound .

regards Olaf

 

[olafk]

A9

Here the very first design for the A9. A little bit unusual format, but enough for a first test . Could be a little flat amplifier.
Not tested - coming weekend. Notes gladly welcome.

regards Olaf

 

[still4given]

Nice! will you attach the foil?