100W Ultimate Fidelity Amplifier

[olafk]

Sorry, I mean the PCB is ok for mounting on main heatsink. On my prototype it is on the other side of PCB.

regards

 

[apexaudio]

Nice work .
My opinion is that MPSA13 must in thermal contact with main heatsink.
Any replacement for mpsa92? can't find it in my place..

MPSA92 can be replaced with 2N5401

 

[thimios]

AX11 under constraction

Thanks Apex but 2N 5401 arivved in few days and i Anxious to listen today.
Any other common replacement
Just for test...
the sundays should find him next to it.http://www.youtube.com/watch?v=n5KmgciKEf0
http://www.youtube.com/watch?v=BqzhbE0QlHc

 

[apexaudio]

Thanks Apex but 2N 5401 arivved in few days and i Anxious to listen today.
Any other common replacement
Just for test...
the sundays should find him next to it.QUASI'S NMOS200 - YouTube
hexfet amplifier - YouTube

What is your rail voltage for test, BC556 can be use under +/-30V.

 

[thimios]

AX11 under....test!

What is your rail voltage for test, BC556 can be use under +/-30V.

Hi Mr.
As i promise the AX11 is here today
bf 872 instade of mpsa92 diferent base
2n6427 instade of mpsa13 same base
2sa1943
2sc5200 final out
Tested rail voltage +/- 23v from two stabilized power supplies
Thats for now ....coming soon on youtube!
For listening of cource.
Thanks Mr Apex.
Pai attention ..in first two photos bd139 and bd140 wrong position!

 

[thimios]

AX11 under....test!

Testing this amplifier today i see that idle current at rail voltage+/-22v is 0ma.(v on 0.22R/5w is 0mv).
Mr. Apex can you post the max +/- rail voltage for this amplifier.
Can i use +/-42v ?
What about idle current?
Thanks for all.

 

[apexaudio]

Testing this amplifier today i see that idle current at rail voltage+/-22v is 0ma.(v on 0.22R/5w is 0mv).
Mr. Apex can you post the max +/- rail voltage for this amplifier.
Can i use +/-42v ?
What about idle current?
Thanks for all.

AX11 rail voltage is +/-40V (+/-50V max). Idle current can be adjust like in BA1200.
Regards

 

[thimios]

AX11 under....test!


Instant replay.
Many many thanks!
Suppose with different value of 3k3 on base of mpsa13 or trimer....
And what value is suggested for +/-42v?
Again thanks.

 

[apexaudio]

Instant replay.
Many many thanks!
Suppose with different value of 3k3 on base of mpsa13 or trimer....
And what value is suggested for +/-42v?
Again thanks.

Use trimer and set about 15mV on 0.33R/5W

 

[thimios]

AX11 under....test!

Thanks Mr.
Coming soon with measurments and listen experience.
I'll post a sort video with yesterday's test's on youtube now .

 

[thimios]

AX11 under....test!

Thanks Mr.
Coming soon with measurments and listen experience.
I'll post a sort video with yesterday's test's on youtube now .

Here is.APEX AX 11 BY THIMIOS - YouTube

 

[mharko]

Hi Mr Apex

What is minimum voltage for rail?
Congratulations,Beatiful designs.

Mharko

 

[apexaudio]

Hi Mr Apex

What is minimum voltage for rail?
Congratulations,Beatiful designs.

Mharko

+/-25V is minimum suggested rail voltage.

 

[mharko]

Thank you very much!

 

[apexaudio]

Here is.APEX AX 11 BY THIMIOS - YouTube

Nice you can fix VAS transistor to heatsink for better cooling like this:

 

[tinitus]

HX11 test with +/-50,+/-70V rail voltage.....[/url]

suggestion how to do that power supply ?

35+35V main trafo, and adding a 12+12V or 15+15V trafo ?

 

[apexaudio]

suggestion how to do that power supply ?

35+35V main trafo, and adding a 12+12V or 15+15V trafo ?

HX11 work with +/-40V,+/-80V rail voltage or 4x28vac

 

[wiljj78]

HX11 work with +/-40V,+/-80V rail voltage or 4x28vac

Will you recommend 2 pairs for this voltage? What would be the max power can obtain with 2 pairs?

 

[apexaudio]

Will you recommend 2 pairs for this voltage? What would be the max power can obtain with 2 pairs?

Yes and 2 pairs of mosfets also.

 

[wiljj78]

Yes and 2 pairs of mosfets also.

Lovely...what about the power?