NAIM NAC 42.5 Vintage for my updated NYTECH CPA 602 - 2012 - diyAudio
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Old 12th August 2012, 07:44 PM   #1
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Default NAIM NAC 42.5 Vintage for my updated NYTECH CPA 602 - 2012

Gentlemen,

as I'm actually preparing an update of my good old NYTECH CPA602's (DIY Project - Nytech CPA602 today ...) they need also a good updated source.

By developing the 602's lohk offered me a NAIM NAC 42 PreAmp Board. As this is also a good old piece of British Hifi this will be my new PreAmp.

This is the board:
Click the image to open in full size.

I will use my new boxes ....
Click the image to open in full size.

And this is the front for my new PreAmp
Click the image to open in full size.

And there are a lot of questions to setup a Pre with the NAIM Board:
- How should a good Power Supply looks like?
- How can I improve the Board? Is a recapping neccessary?
- How should a input selector looks like? I need 6 Sources ...
- ....

Hopefully I can get some help here ....

My idea is, to set up a new 42.5 as good as possible ....

Regards from Germany

Ingo

Last edited by NRWler04; 12th August 2012 at 09:16 PM.
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Old 12th August 2012, 10:11 PM   #2
lohk is offline lohk  Europe
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Ok, Ingo, lets roll it!
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Old 12th August 2012, 10:13 PM   #3
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Ok Klaus,

have a look here: pink fish media - View Single Post - NAIM NAC 42 VINTAGE for my updated NYTECH CPA602's ...
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Old 13th August 2012, 09:20 AM   #4
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Default Input Selection

Hello,
i am currently developing a smart input selector based on reed relais and
with a modul for iPad/iPhone - remote control.
The main idea is to have the old fashion potentiometer and selector-switch
in parallel with digi-interface so that both can be used.
The analog part will be supported by Burr Brown op-amps.

The final pcb will of course fit into NRWler04's designer boxes.

regards

Quote:
Originally Posted by NRWler04 View Post
Gentlemen,

as I'm actually preparing an update of my good old NYTECH CPA602's (DIY Project - Nytech CPA602 today ...) they need also a good updated source.

By developing the 602's lohk offered me a NAIM NAC 42 PreAmp Board. As this is also a good old piece of British Hifi this will be my new PreAmp.

This is the board:
Click the image to open in full size.

I will use my new boxes ....
Click the image to open in full size.

And this is the front for my new PreAmp
Click the image to open in full size.

And there are a lot of questions to setup a Pre with the NAIM Board:
- How should a good Power Supply looks like?
- How can I improve the Board? Is a recapping neccessary?
- How should a input selector looks like? I need 6 Sources ...
- ....

Hopefully I can get some help here ....

My idea is, to set up a new 42.5 as good as possible ....

Regards from Germany

Ingo
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Old 14th August 2012, 09:15 PM   #5
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No input here for optimizing a NAIM 42 ...?????
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Old 17th August 2012, 11:10 PM   #6
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Unfortunately Naim topology - single ended with tantalum coupling caps is rather limited in what you can do with it. A shunt regulator might be worth persuing and getting rid of the coupling caps for film ones is about all. The topology is too limited ( forget the PRAT - the mystical rythym, timing , and all that nonsense).
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Old 17th August 2012, 11:36 PM   #7
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What is PRAT? Never heard it before ....
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Old 17th August 2012, 11:39 PM   #8
Salas is offline Salas  Greece
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Pace Rhythm And Timing magazine slang not sure if it was Martin Colloms that introduced it.
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Old 17th August 2012, 11:42 PM   #9
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Ah ... I'm interested whats possible with the 42 board ... should only be better then my Nytech CP112 ....
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Old 19th August 2012, 11:16 AM   #10
lohk is offline lohk  Europe
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If you do not like Tantalums in the signal path, you can very easy substitute with something which suits you more. But film caps usually show more distortion when used permanently DC biased.
What is wrong with the "technology"? The buffer is a diamond transistor-combo with a nice CCS, better that with less parts! The gain amp is equally simple. Those single ended classA circuits are very sensitive to power supplies and parts quality and variation, but thats their only fault in my oppinion. Otherwise many other designers (like Nelson Pass) would be to blame.
PRAT was introduced to find something more musically relevent when describing sound quality, than the more technical descriptions like distortion or power, or the more hifi-ish descriptions like spaciousness.
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