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Old 14th June 2013, 09:05 PM   #2341
olafk is offline olafk  Germany
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Sorry, I mean the PCB is ok for mounting on main heatsink. On my prototype it is on the other side of PCB.

regards
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Old 14th June 2013, 11:03 PM   #2342
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Quote:
Originally Posted by thimios View Post
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
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Old 15th June 2013, 02:48 AM   #2343
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Default 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

Last edited by thimios; 15th June 2013 at 03:03 AM.
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Old 15th June 2013, 07:37 AM   #2344
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Quote:
Originally Posted by thimios View Post
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.
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Old 15th June 2013, 12:05 PM   #2345
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Default AX11 under....test!

Quote:
Originally Posted by apexaudio View Post
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!
Attached Images
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Last edited by thimios; 15th June 2013 at 12:08 PM.
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Old 16th June 2013, 12:47 PM   #2346
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Default 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.
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Old 16th June 2013, 12:54 PM   #2347
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Quote:
Originally Posted by thimios View Post
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
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Old 16th June 2013, 01:06 PM   #2348
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Default 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.
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Old 16th June 2013, 01:44 PM   #2349
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Quote:
Originally Posted by thimios View Post

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
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Old 16th June 2013, 01:58 PM   #2350
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Default 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 .
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