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Old 31st October 2011, 03:09 PM   #921
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Quote:
Originally Posted by MATSAZILIN View Post
Dear Apex, Im try to desighn the preamp for my b500. could you please to chack for me this desighn. Ultimate Fidelity Amplifier
Your pcb design for stereo preamp from post #57 is OK, I suggest to use stereo buffer as preamp.
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Old 1st November 2011, 07:15 AM   #922
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Default TEF Configuration

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Originally Posted by apexaudio View Post
Yes TEF is Triple Emitter Follower output stage like this AX18.
I want to know the correct placement of bd139 for correct thermal compensation in tef configuration.should it be mount on on the first stage of tef configuration ? shuold all these transistor in tef configuration be mount on the same heatsink along with the output transistor together with bd139?

regards,
drowranger
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Old 1st November 2011, 08:31 AM   #923
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Quote:
Originally Posted by drowranger View Post
I want to know the correct placement of bd139 for correct thermal compensation in tef configuration.should it be mount on on the first stage of tef configuration ? shuold all these transistor in tef configuration be mount on the same heatsink along with the output transistor together with bd139?

regards,
drowranger
BD139 must be mounted on the same heatsink together with drivers and outputs, only predrivers can be placement separate,
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Old 1st November 2011, 12:36 PM   #924
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AX17 corected polarity of C4
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Old 3rd November 2011, 10:44 PM   #925
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Quote:
Originally Posted by Arif Budiyanto View Post
good sounding amplifier....even built with low budget components...
Please share your work,
Regards
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Old 4th November 2011, 01:21 AM   #926
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Ok Dear Mr. Apex. I will take a picture and post it...later...I put B1 buffer. It's a little bit difficult to find good caps with higher votage more than 63 volt. I plan to supply 45 - 0 - 45 Vac. Some suppliers only have 50 volt as a common. Now it is operating in 40 - 0 - 40 Vac.
Best Regards,
Arif
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Old 4th November 2011, 08:04 AM   #927
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Halow
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Old 4th November 2011, 08:18 AM   #928
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Smile This my B500 Version 2 Final Transistor

I really enjoy the fruits of his voice and the strength of this power is enough to vibrate my house. Thanks Mile. I Love u so much
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Old 4th November 2011, 08:28 AM   #929
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Hi Mr. Damanhuri, one of my best friends in local audio community forum. I am still courious with this amplifier reproduction. With some components up grades I hope it will make better sound.

Dear Mr. Slavkovic./ Apex:
How about changing the transformer into toroidal type? Will it make a lot of improvements? My friend has some bad experiences using toroidal transformers, 2 times blew up after 2 hours operation. There were because of the toroidal quality I supposed. Now he is trying to make his own toroidal.
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Old 4th November 2011, 09:37 AM   #930
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Quote:
Originally Posted by Arif Budiyanto View Post
Ok Dear Mr. Apex. I will take a picture and post it...later...I put B1 buffer. It's a little bit difficult to find good caps with higher votage more than 63 volt. I plan to supply 45 - 0 - 45 Vac. Some suppliers only have 50 volt as a common. Now it is operating in 40 - 0 - 40 Vac.
Best Regards,
Arif
I suggest to use regulated PSU.
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