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Old 20th August 2002, 11:45 PM   #1
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Default Schematic for naim amp

Hi does any one have a scematic for a Naim nap250 amp or in the nap series

Cheers

Anthony
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Old 21st August 2002, 03:23 PM   #2
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Default Re: Schematic for naim amp

Quote:
Originally posted by ANTHONY2181
Hi does any one have a scematic for a Naim nap250 amp or in the nap series
Hi Anthony,

the schematics can be found on Neil McBride's Naim site: http://www.neilmcbride.co.uk/

regards,
Hartmut
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Old 21st August 2002, 04:08 PM   #3
ALW is offline ALW  United Kingdom
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Default Be aware

that the schematics at Neil's site are generic, rather than absolute. Component values (e.g. o/p devices) are different from the actual devices used, which are unique to Naim.

They are representative of topology though.

Andy.
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Old 21st August 2002, 06:48 PM   #4
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As topologies go, they don't get any more generic.
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Old 21st August 2002, 06:57 PM   #5
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Wink Nelson Pass!

I didn't think you were the type to name Naims..... shame on you.

H.H.
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Old 21st August 2002, 11:58 PM   #6
lohk is offline lohk  Europe
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Search the Naim Forum naim-audio.infopop.net for some more information about parts and values.
(hint: the NAP90 output transistors)
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Old 22nd August 2002, 06:07 AM   #7
ALW is offline ALW  United Kingdom
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Default True enough

Quote:
As topologies go, they don't get any more generic.
That's true, strange though how almost every other amplifier I've heard just doesn't get the musical juices flowing in the same way these do.

So many manufacturers, so many designers, so much more advanced circuitry....so little music

Ever heard a Krell - makes me want to go to sleep!

Andy (Naim user).
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Old 22nd August 2002, 07:42 AM   #8
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Default Re: True enough

Quote:
Originally posted by ALW
That's true, strange though how almost every other amplifier I've heard just doesn't get the musical juices flowing in the same way these do.
That they do. I'd be interested in a schema too. One of my NAP160s has a bad ocsillation that we are having trouble sorting out. I must say thou that the SE EL84 amp i popped in its place does some things musically the NAIM doesn't.

dave
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Old 22nd August 2002, 11:26 AM   #9
lohk is offline lohk  Europe
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Default ...musical juices flowing...

I can second that.
Although I heard many amps in the last twenty-something years, and some of them did certain things much better, no others amps did deliver music in general with the same ease and sheer power than the NAIMS.
Sweet ? Sometimes.
Spacy and etherical ? No.
Musical pace and drive ? Yessir.
Boring (like so many others)? Not at all.


But DIYers or cloners beware: There are more details to consider than just the schematic. There are several threads here at the forum btw.

Klaus (NAIM user - originals and DIYversions )
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Old 22nd August 2002, 01:32 PM   #10
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Default Fussy Amplifiers

Hi Dave, my experience of Naim amps is that they require highly inductive speaker cable, and I have read that this is intentional.
The Naim cables that I have seen look like 300 ohm tv ribbon cable only way oversized - standard transmitter cable maybe.
Each leg consisted of not very many 0.8 mm or so strands insulated and seperated by stiff black plastic dielectric.
I think it was a Nap-160 that did not like 10-pair telephone cable (reasonably capacitive and virtually zero loop inductance) and oscillated and sounded loaded down a bit, got a bit hot but did not break.
This is the only amp to misbehave with this cable IME.
These amps are very load critical/dependant IME, and when sitting right they are quite nice and when loaded wrong they go wrong.
Short cables when bi/tri amping might be inappropriate.
If it is board level ask me more.

Eric.
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