Balanced input all DC coupled RIAA preamp - diyAudio
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Old 22nd April 2010, 08:57 PM   #1
FdW is offline FdW  Netherlands
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Default Balanced input all DC coupled RIAA preamp

After building lots of prototypes, first unbalanced and later with balanced inputs, I settled at the configuration show in this post. The posted configuration was considered the best sounding one that I have build and presented to my listening panel (actually 4 people, all used to listen to life music and owning high end audio systems).

Im sure that posting these schematics is not going to make me famous, and I am aware of the fact that critiques here may make me look a bit silly. But I need to know, what do you diy people here, whose messages I am reading for years on end, think about the thing I concocted .

Let me know what you think of it

Regards,
Frans de Wit
Attached Images
File Type: jpg BalancedRIAA.jpg (176.2 KB, 3140 views)
File Type: jpg Power Mains.jpg (336.3 KB, 2922 views)
File Type: jpg Power Raw.jpg (313.2 KB, 2827 views)
File Type: jpg Power Clean.jpg (255.4 KB, 2889 views)
File Type: jpg MMHead.jpg (123.3 KB, 2808 views)
File Type: jpg RiaaAmp.jpg (293.9 KB, 1954 views)
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Old 22nd April 2010, 09:05 PM   #2
FdW is offline FdW  Netherlands
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Default Balanced input all DC coupled RIAA preamp

There is also a MCHead

Regards,
Frans de Wit.
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File Type: jpg MCHead.jpg (138.3 KB, 1728 views)
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Old 22nd April 2010, 09:21 PM   #3
FdW is offline FdW  Netherlands
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Default Balanced input all DC coupled RIAA preamp

And the PCB's

Regards,
Frans de Wit.
Attached Images
File Type: jpg PCB Power Bottom.jpg (234.6 KB, 1196 views)
File Type: jpg PCB Power Top.jpg (231.8 KB, 423 views)
File Type: jpg PCB Preamp Bottom.jpg (333.2 KB, 486 views)
File Type: jpg PCB Preamp Top.jpg (334.4 KB, 536 views)
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Old 22nd April 2010, 09:28 PM   #4
FdW is offline FdW  Netherlands
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Default Balanced input all DC coupled RIAA preamp

Finaly, more pictures can be seen at RIAA Preamplifier - a set on Flickr

Regards,
Frans de Wit.

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Old 22nd April 2010, 10:18 PM   #5
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Very nicely build ! I like the chambers. The LME49710 is a bit noisy for MC work, so are the 51 Ohm resistors. Topology is fine but i whould use the new LME4990, reduce the 51 Ohm to 10 Ohm and take 1.2kOhm feedback resistors. I really like the simplicity of your design and you did a major efford in the PSU so why waisting SN in the input stage ?
I do not know if that new OPamp is freely awaillable I got mine as free samples.
You could also try the AD797, LT1115, LT1020, OPA211, OPA1611 and there is a new low noise chip from Analog Devices.
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Old 22nd April 2010, 10:20 PM   #6
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Sorry, not LT1020 but LT1028. What are the black resistors ? Welvyn ?
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Old 22nd April 2010, 10:32 PM   #7
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Quote:
Originally Posted by Joachim Gerhard View Post
Sorry, not LT1020 but LT1028. What are the black resistors ? Welvyn ?
If not are Welvyn will be Holco.....
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Old 23rd April 2010, 06:35 AM   #8
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Quote:
Originally Posted by Joachim Gerhard View Post
Sorry, not LT1020 but LT1028. What are the black resistors ? Welvyn ?
The risistors are 1/4watt IRC metal film types
RC55LF-D-100K-B-B IRC Metal Film Resistors
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Old 23rd April 2010, 06:50 AM   #9
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Very nicely build ! I like the chambers. The LME49710 is a bit noisy for MC work, so are the 51 Ohm resistors. Topology is fine but i whould use the new LME4990, reduce the 51 Ohm to 10 Ohm and take 1.2kOhm feedback resistors. I really like the simplicity of your design and you did a major efford in the PSU so why waisting SN in the input stage ?
I do not know if that new OPamp is freely awaillable I got mine as free samples.
You could also try the AD797, LT1115, LT1020, OPA211, OPA1611 and there is a new low noise chip from Analog Devices.
When possible I will do a test with the proposed components, as I do not own a MC cartridge and my TD160b with SME3009 is not suitable, I need to arrange to use my friends player (and he lives Paris [I am in Holland]).

There is an audio sample available that was recorded using a Koetsu Rosewood Signature on a SME Series 20/2 record player. (For me it sounds like virtually noise free).
Diy ADC's

Regards,
Frans de Wit.
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Old 23rd April 2010, 07:17 AM   #10
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Quote:
Originally Posted by Joachim Gerhard View Post
The LME49710 is a bit noisy for MC work... i whould use the new LME4990...
Is this the one you are recommending
http://www.national.com/ds/LM/LME49990.pdf
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