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Mod/upgrade NAD C 541i
Mod/upgrade NAD C 541i
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Old 22nd September 2008, 09:27 PM   #121
HiFiNutNut is offline HiFiNutNut  Australia
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Join Date: May 2004
Location: Sydney
10uF Clarity caps are large! They could just fit into the chasis.

I used 2.2uF only. By increasing the resistor after the coupling cap you could have a very low corner frequency without ill effect. The increased noise is so small that it can be totally ignored.

I can't remember what that resistor value from my memory, but if you use 10uF then as long as the resistor is greater than 10k it should be fine. It would not cause loss of bass.

Seriously, I would increase the bypass capacitors so that the power supply can have a lower impedance at lower frequencies. This may help increase the bass response.
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Old 22nd September 2008, 10:04 PM   #122
HiFiNutNut is offline HiFiNutNut  Australia
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Join Date: May 2004
Location: Sydney
Could someone be kind to send me a NAD541i service manual?

Regards,
Bill
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Old 23rd September 2008, 09:14 PM   #123
HiFiNutNut is offline HiFiNutNut  Australia
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Got the NAD541i service manual now. Thanks.
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Old 28th October 2008, 05:10 PM   #124
Randomizer is offline Randomizer  United States
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Join Date: Jul 2008
Default replace output

nadclock,

Have you replaced the output section?
There is a universal tube output from DIY Hifi Supply that I'd like to use.

Where does the output start so?
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Old 28th October 2008, 10:23 PM   #125
Randomizer is offline Randomizer  United States
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Default A link to the tube output

Here is a picture and link to the tube output stage

http://www.diyhifisupply.com/?q=node/399

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.
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Old 6th November 2008, 02:16 PM   #126
saran is offline saran  India
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Join Date: Jul 2008
Unhappy No USE

Done the modification as mentioned below to my NADc542 but of no use..Now it doesnt read some other discs too..

Aparently the following has to be done in c542:

1. Change resistor R227 from 100R to a jumper wire.
2. Change resistor R103 and R104 from 20K to 15K.
3. Change resistor R218 from 15K to 47K.
4. Change capacitor C221 from 0.1uF to 3900 pF.

the resistors 103 and 104 in my C542 is not 20k.
its colour band has.. brown ,black ,black,black ,brown

Can some one send me the c542 Sevice mnual to

saravanan.cn@gmail.com


Thanks
saran
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Old 25th November 2008, 05:35 AM   #127
saran is offline saran  India
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Join Date: Jul 2008
Talking Done the Mods with NAD c352

janusz,

found out the mistake, had replaced some other resistor,
Now I have done the mods properly as per your sugesstion .

The cd player is reading all the discs even the one that I compile from my PC .


Trying to do the same in my friends NAD c541i. Need service manual Can any one send me the manual for c541i

Saravanan.cn@gmail.com

Thanks in advance
saran
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Old 27th January 2009, 03:37 PM   #128
canned70 is offline canned70  Germany
diyAudio Member
 
Join Date: Oct 2008
Default want to mod my C542

Hello all,

I want to try some mods on my C542

For this reason I'm looking for a service manual.

Maybe someone of you can help me ;-)

my email is marc.bauer at franken-online.de.de

kind regards Marc
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Old 27th January 2009, 09:06 PM   #129
canned70 is offline canned70  Germany
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Join Date: Oct 2008
Default wrong mail address

Sorry, my correct address is
marc.bauer at franken-online.de

thanks Marc
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Old 25th February 2009, 01:37 AM   #130
kelly is offline kelly  United States
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Join Date: Mar 2007
What is the purpose of R375(R376) and R379(R380) in the NAD 542?

If the muting transistors are removed, can these resistors be removed?

Why are there two muting transistors per channel?
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