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Old 6th December 2005, 01:10 PM   #1
etsang3 is offline etsang3  Hong Kong
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Default Naim Nait-2

I am helping my friend to modify Naim Nait-2 int. amp.
I may post photos after the job is finished.
Here is the circuit I would like to share.
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Old 6th December 2005, 01:11 PM   #2
etsang3 is offline etsang3  Hong Kong
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Default Naim Nait-2 Line amp

Naim Nait-2 Line amp
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Old 6th December 2005, 01:13 PM   #3
etsang3 is offline etsang3  Hong Kong
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Default Naim Nait-2 Power-amp Stage

Naim Nait-2 Power-amp Stage
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Old 6th December 2005, 01:27 PM   #4
lohk is offline lohk  Europe
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These are schematics of the old (and famous) NAIT 1 (a scaled down version of the bigger cousins). Why do you want to modify the historical gem?
(Maybe the PSU caps have to be replaced because of age.)
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Old 6th December 2005, 02:03 PM   #5
etsang3 is offline etsang3  Hong Kong
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Hi, lohk

(Maybe the PSU caps have to be replaced because of age.)
Yes. what we call the modification is mainly replacing the old cap to some Audio Grade new cap. We maintain the old value too.
Add some caps at the legs of the power transistors which are connected to the filter caps. The circuit tracks of that portion are quite long and thin.
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Old 6th December 2005, 05:30 PM   #6
HOEK is offline HOEK  Netherlands
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hello

what is the voltage for the units?
Can you show a schema of the PSU








thanks
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Old 6th December 2005, 07:39 PM   #7
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The PSU is a simple centre-tapped 120VA transformer, 18-0-18VAC, with a bridge rectifier and 6300uF, 40v caps. There is a separate rectifier stage for the line amp stages.

I've a bit more info on servicing the Nait 2 here:
http://www.acoustica.org.uk/t/nait/nait2.html
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Old 6th December 2005, 11:57 PM   #8
lastguy is offline lastguy  United States
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from the circuit the product design seems lower than average. Don't know how it become so famous.
A famous magzine editor used to say: DIY HiFi is a big lier, when XXX put a market a class B everybody say good, when you spent $xxx to buy a speaker wire, you get to lie to yourself it is better.
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Old 7th December 2005, 02:01 AM   #9
etsang3 is offline etsang3  Hong Kong
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Hi lastguy, you may be right, more right. I am a DIYer and an EE for many years. At the beginning, I cannot believe and explain that such lower than calculation amp can sound good. But if you have listened to it. You will be amazed by it musical performance. (but with limitation). When you use it to play Pop or rock music, it is a total different story. It can't perform those material. Rock music sound like classical music (I consider). Nait capabilities are on those chamber, single instrument, vocal, light jazz and vocal music etc... I assume, it accurate and clean musical performance is due to its simple design (only 3 or 4 stages), low amount of negative feedback (open-loop gain is not high) and low power consumption (just 20mA idle current at the O/P transistor !).
If you are enjoying the music contents within Nait-2 list, you'll like it and keep using it for long years. It can't work for you for those louder American Country music (e.g. Thank God I am a Country Boy) nor Pop music (e.g. Bad, the Sad Cafe ) nor Big Symphony (e.g. 1812, Beethoven No. 5). My friend use it for years but I like the kind of music not on the Nait-2 list so I built a Class A 100W to listen to virtually all music or signal or noise.
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Old 7th December 2005, 03:55 AM   #10
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Hi etsang3,

My... all those electros in the signal path AND the very ordinary topology with poor supply filtering and PSRR.

No wonder it becomes easily confused on complex passages.

Hi lokh,

...."Why do you want to modify the historical gem? "

Gem.. hahahaha.

Have to agree with last guy.

Cheers,
Greg
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