Naim Nait circuit

R1234 · 31st May 2011, 10:22 AM

I have recently acquired an old Naim Nait amp.
Would anyone have a circuit diagram of this amp or a site where I can download one.

Thanks.

GEirin · 10:14 PM

Hi R1234

(copyrighted material removed by moderators)

R1234 · 1st June 2011, 12:17 PM

Thanks very much GEirin. I take it that all the Nait models were similar as the date on the circuit is much later than the model I have.
Also, do you happen to have the circuit for the Pre-amp & the power supply as this would be appreciated.

Thanks.

Josip_Del · 1st June 2011, 03:46 PM

Ok I am planning to clone Naim nap 140 can I put BC639/640 as replacement for ZTX etc. and when powering amp trim pot must be set on max or min resistance. And when adjusting bias I must observe voltage drop on output transistors? Input transistors must be matched? Thanks

Josip_Del · 2nd June 2011, 03:16 PM

Someone?

martin clark · 2nd June 2011, 04:22 PM

Beware, the Nait circuit is only similar to the one posted - you will have to trace your own to discover the differences. The Avondale NCC200 schematic is a development based on Naim's '250' power amp circuit and chnages a couple of details completely in the input stage, completely omits the SOA protection etc.

Just trace the NAIT circuit yourself - it does not take long.

ingenieus · 09:54 PM

I owned one of the original Naits when they came out. It didn't last long. With all of 15W it sounded nice but could not do loud, as I remember. It was replaced by a Tandberg 3012 integrated amp, which in turn was replaced by a 32/SNAPS/250 that is still around.

SY · 2nd June 2011, 10:15 PM

Copyrighted material removed. It is against forum rules to post it without permission of the copyright owner.

GEirin · 2nd June 2011, 11:58 PM

Hi all.
Thread: NAP-140 clone amp kit on Ebay.

31st May 2011, 10:22 AM	#1
R1234 diyAudio Member Join Date: May 2011	Naim Nait circuit I have recently acquired an old Naim Nait amp. Would anyone have a circuit diagram of this amp or a site where I can download one. Thanks.

31st May 2011, 07:18 PM	#2
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	Hi R1234 (copyrighted material removed by moderators) Last edited by SY; 2nd June 2011 at 10:14 PM. Reason: copyright

2nd June 2011, 09:45 PM	#7
ingenieus diyAudio Member Join Date: Apr 2011	I owned one of the original Naits when they came out. It didn't last long. With all of 15W it sounded nice but could not do loud, as I remember. It was replaced by a Tandberg 3012 integrated amp, which in turn was replaced by a 32/SNAPS/250 that is still around. Last edited by ingenieus; 2nd June 2011 at 09:54 PM.

2nd June 2011, 10:15 PM	#8
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Copyrighted material removed. It is against forum rules to post it without permission of the copyright owner. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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1st June 2011, 12:17 PM	#3
R1234 diyAudio Member Join Date: May 2011	Thanks very much GEirin. I take it that all the Nait models were similar as the date on the circuit is much later than the model I have. Also, do you happen to have the circuit for the Pre-amp & the power supply as this would be appreciated. Thanks.

1st June 2011, 03:46 PM	#4
Josip_Del diyAudio Member Join Date: Aug 2009	Ok I am planning to clone Naim nap 140 can I put BC639/640 as replacement for ZTX etc. and when powering amp trim pot must be set on max or min resistance. And when adjusting bias I must observe voltage drop on output transistors? Input transistors must be matched? Thanks

2nd June 2011, 03:16 PM	#5
Josip_Del diyAudio Member Join Date: Aug 2009	Someone?

2nd June 2011, 04:22 PM	#6
martin clark diyAudio Member Join Date: Jul 2003 Location: Bath, UK	Beware, the Nait circuit is only similar to the one posted - you will have to trace your own to discover the differences. The Avondale NCC200 schematic is a development based on Naim's '250' power amp circuit and chnages a couple of details completely in the input stage, completely omits the SOA protection etc. Just trace the NAIT circuit yourself - it does not take long.

2nd June 2011, 11:58 PM	#9
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	Hi all. Thread: NAP-140 clone amp kit on Ebay.

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