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Old 11th February 2012, 07:06 AM   #461
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Quote:
Originally Posted by Arif Budiyanto View Post
Dear Apex,
At 63 Vdc, mj's were getting warm after few minutes...maybe those were have to be put on heat sink ...
Thank you very much
MJE340/350 must have heatsink.
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Old 11th February 2012, 07:41 AM   #462
44250 is offline 44250  Serbia
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Quote:
Originally Posted by apexaudio View Post
I suggest to use TOP3 outputs like SanKen 2SA1294/2SC3263.
For test use 150R/10W instead fuse in 220V AC line.
The pcb should be a little bit bigger,i´d say about 20% . I´ve searched forum pages and pages earlier written but i haven´t found this file,could someone suggest me a page/post where it was posted?

And yes,ALEX MM you´re amasing! I have allready saved two pcb/layouts of SR200 designed by you,and if i find it this would be third!

Thank you for all pcb-layouts given to us!
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Old 11th February 2012, 09:21 AM   #463
naf is offline naf  Indonesia
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@44250:
see here for pcb with sanken Studio Reference Amplifier
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Old 11th February 2012, 09:49 AM   #464
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Quote:
Originally Posted by naf View Post
@44250:
see here for pcb with sanken Studio Reference Amplifier

Thank you for trying,but this is the pcb http://i1266.photobucket.com/albums/...p/DSC_0008.jpg that i am looking for.
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Old 11th February 2012, 10:58 AM   #465
naf is offline naf  Indonesia
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is this you looking for?
Studio Reference Amplifier
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Old 11th February 2012, 11:08 AM   #466
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I'm sorry, and maybe this has been discussed before, but shouldn't Q11/BD139 be on the same heatsink as the output transistors?

Or as D. Self suggested on his book, bolted to one of the output transistors?

I hadn't paid attention to the pcbs before, so I hadn't realized that.

On a bipolar output amp there should be some tracking of the temperature, and the VBE transistor should do that.
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Old 11th February 2012, 12:39 PM   #467
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Quote:
Originally Posted by 44250 View Post
The pcb should be a little bit bigger,i´d say about 20% . I´ve searched forum pages and pages earlier written but i haven´t found this file,could someone suggest me a page/post where it was posted?

And yes,ALEX MM you´re amasing! I have allready saved two pcb/layouts of SR200 designed by you,and if i find it this would be third!

Thank you for all pcb-layouts given to us!
This pcb is in post #154
Regards
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Old 11th February 2012, 12:59 PM   #468
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About my comment, it certainly does not refer to pcb on post #154.

VBE transistor is at it should on the same heatsink.
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Old 11th February 2012, 02:12 PM   #469
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Quote:
Originally Posted by naf View Post
is this you looking for?
Studio Reference Amplifier
Yes yes that is the one! I´ve started with searching from last to first page,that is why i haven´t found it. Thank you so much!

Quote:
Originally Posted by apexaudio View Post
This pcb is in post #154
Regards
I allready have files for "SR200 V2" and "SR200 V2.3" (both done by alex mm) ,but i haven´t had this one with side mounted outputs. When i begin to do SR200 it will be V2.3 ,and i allready have donor for it,it is some unrepairable amplifier with working 2 x 53VAC 900VA transformer,side mounted heatsinks and good looking fabric metal box with 2 x 14 led power level indicator...more than half parts needed. If i find a picture of it i will post it.
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File Type: jpg IMG_1810.jpg (261.6 KB, 760 views)
File Type: jpg IMG_1802.jpg (450.0 KB, 707 views)

Last edited by 44250; 11th February 2012 at 02:18 PM.
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Old 11th February 2012, 02:20 PM   #470
44250 is offline 44250  Serbia
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That i going to be APEX SR200,one fine day,this year!
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