Meridian 508.24 - modding opamps - diyAudio
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Old 31st March 2010, 01:13 PM   #1
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Default Meridian 508.24 - modding opamps

I have tried finding info regarding modding the opamps that are in the 508.24 but found only limited info. I have not popped the top yet, but believe that there are 4 NE5534's, of which two are used for summing the balanced out from the DACS to the single ended output, and the other two are used for the I/V conversion. That is just a hunch, but if anyone had a schematic or knowledge regarding the matter I would appreciate it.
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Old 1st April 2010, 04:41 AM   #2
EUVL is offline EUVL  Europe
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I have a schematics. You may try to ask Meridian for one if you are an owner with serial number and registered with them.

The opamps are NE5534 (at least on mine).
I have tried OPA627 (sounds good but supply voltage is too low for the 627s), am currently using OPA727 (more suited for +/-5V), and shall be swapping them for LT6230 soon, but need to etch a special adaptor board first.

If you want to try the same, you may get 4 Bungard boards from me at a nominal cost. Send me a PM.
LT6230 you can get from Digikey.


Patrick

Last edited by EUVL; 1st April 2010 at 04:44 AM.
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Old 1st April 2010, 04:49 AM   #3
EUVL is offline EUVL  Europe
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Incidentally I also tried increasing the bias of the output transistors, but this made little or no difference, so I went back to the original circuit in the end. But the opamps has been staying there for 3 years now, until I found the LT6230.


Patrick
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Old 24th February 2011, 05:38 PM   #4
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Quote:
Originally Posted by EUVL View Post
Incidentally I also tried increasing the bias of the output transistors, but this made little or no difference, so I went back to the original circuit in the end. But the opamps has been staying there for 3 years now, until I found the LT6230.


Patrick
LT6230 until forever???
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Old 24th February 2011, 07:36 PM   #5
EUVL is offline EUVL  Europe
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Till now yes.




Patrick
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Old 25th February 2011, 02:27 AM   #6
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Quote:
Originally Posted by EUVL View Post
Till now yes.




Patrick
thank you very much!
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Old 25th February 2011, 02:29 AM   #7
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Quote:
Originally Posted by EUVL View Post
Till now yes.




Patrick
have a your 508 mods pic?
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Old 25th February 2011, 03:33 AM   #8
EUVL is offline EUVL  Europe
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No, but it is just replaced opamps.
I have a few spare PCBs if you want to try.


Patrick
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Old 25th February 2011, 04:12 AM   #9
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i seen your email.
thank very much
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Old 25th February 2011, 09:36 AM   #10
EUVL is offline EUVL  Europe
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As promised some pictures of the opamp adaptors.
A skilled DIYer would have no problem making the same for himself.

(PS The LT-Chip should face downwards towards the Meridian PCB.
....The "closed holes" have pins to replace connections for the DIP-8 Opamp.)


Regards,
Patrick

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Attached Images
File Type: jpg 110225 LT6230 s.JPG (527.6 KB, 171 views)

Last edited by EUVL; 25th February 2011 at 09:41 AM.
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