NAP-140 Clone Amp Kit on Ebay - Page 58 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 6th December 2010, 06:34 PM   #571
diyAudio Member
 
Join Date: Jul 2010
Location: the hague
Default It's alive!

Just "finished" the build of my NAP-140 clone. Still have some tidying-up to do, but it works just fine.
2 transformers 30-0-30 120 VA feeding 6x4700 mF + 1 mF film / channel all connected with 1,5 mm copper to the NAP-clones (hifidiy.net)
Preamp is a simple single op-amp design (OP-177) with 2x amplification and a seperate power supply (78/7915) connected to the NAP with very inexpensive wire and a downright cheap pot.
Speakers are connected via a turn-on delay, but I think I need to add a fuse in the ground-line.

Of course these things are never finished, but what would you advise as the next step to take? (sound-quality-wise)
Attached Images
File Type: jpg NAP140 clone.jpg (112.6 KB, 1107 views)
  Reply With Quote
Old 6th December 2010, 07:13 PM   #572
diyAudio Member
 
barry.childs's Avatar
 
Join Date: Jun 2008
Location: Lostwithiel, Cornwall
It looks good. I like the twin transformers. It should improve the bass. I would suggest a better pre-amp. There is actually a Naim nac 42.5 clone on ebay. Regards Barry
  Reply With Quote
Old 6th December 2010, 09:31 PM   #573
johnm is offline johnm  United Kingdom
diyAudio Member
 
johnm's Avatar
 
Join Date: Sep 2003
Location: Hampshire
I keep seeing these referred to as NAP140 clones, when in fact they are clones (and not 100% accurate at that) of the Avondale NCC200 amp boards.

If you want to clone the NAP140 I suggest downloading every picture of the NAP140 or 180 circuit boards you can find on the net and a schematic and alter the necessary components on the Gigaworks boards. It's not too hard to do (I did it once though haven't got the relevant docs any longer alas, though could post photos of my boards) and does get you one step closer to that addictive Naim sound...

- John
  Reply With Quote
Old 7th December 2010, 07:52 AM   #574
diyAudio Member
 
Join Date: Jul 2010
Location: the hague
Quote:
Originally Posted by johnm View Post
I keep seeing these referred to as NAP140 clones, when in fact they are clones (and not 100% accurate at that) of the Avondale NCC200 amp boards.

- John
You are absolutely correct. It has been brought up a number of times in this thread. The amp I build is not a NAP-140 clone, but it is an amp that is reffered to as beeing a NAP-140 clone. So I thought that the name NAP-140 clone describes the amp I build close enough for most people here to understand. It is not my intention to build a "real" NAP-140 anyway. After this I will probably move on to a Pass-amp.
  Reply With Quote
Old 16th January 2011, 03:25 PM   #575
diyAudio Member
 
Join Date: Mar 2009
Location: Smoky Mountains, NC
Of course these things are never finished, but what would you advise as the next step to take? (sound-quality-wise)

I built almost identical amp (x 2), an active crossover(ESP) and the Starfish preamp.
I highly recommend the Starfish

Peter
  Reply With Quote
Old 28th January 2011, 08:41 PM   #576
diyAudio Member
 
Join Date: Jan 2004
Location: Sweden
hi,
i finally got around to finishing my tubeshunter boards... they seem to be working properly with a low dc offset after swapping q1 q2 for a set of bc546b with a 10% mismatch in hfe... i am just finishing up a p2p B1 to go with it so i haven't done listening yet on anything but cheap test speaker..

My question is has anyone tried the output transistor decoupling mod mentioned as a noticeable improvement for naim amps at Modifying Naim Audio power amplifiers ?
  Reply With Quote
Old 31st January 2011, 07:58 PM   #577
diyAudio Member
 
Join Date: Nov 2009
Hi, I want to use a speaker protection circuit. I found one on ebay.

Speaker Protection Module -- Stereo Type Two Channels - eBay (item 300515253360 end time Feb-13-11 13:07:33 PST)

What do you think about this module? Any suggestions for other?
  Reply With Quote
Old 1st February 2011, 03:51 AM   #578
Ruwe is offline Ruwe  Europe
diyAudio Member
 
Join Date: Aug 2008
Location: Vancouver, Canada
Voltera,
I'm using this one:
QKits Electronic Kits: K4700, Two Channel Speaker Protection Kit 220VAC

Flappytango,
I've tried the the output transistor decoupling and didn't like it. Nothing wrong looking with the scope, but the sound became dull and I removed it. There was a feeling of "too much" bass. A friend of mine reported the same.
I'm afraid though that we didn't do it properly - the return from the caps of each channel should be tied together and then with a single wire sent directly to the star ground. The way I did it was both caps connected together to the speaker GND output on the board.
May be you should try it, but IMO, this amp benefits more than anything else from wiring with heavier gauges and higher quality of the reservoir capacitors.

Regards
  Reply With Quote
Old 1st February 2011, 09:50 AM   #579
diyAudio Member
 
Join Date: Jan 2004
Location: Sweden
Ruwe,
Thanks maybe ill skip it for now and wait untill i order some parts and give it a try then.

Volterra,
I am using this kit.
Speaker protection circuit stereo kit 30A protection ! - eBay (item 220725085071 end time Feb-13-11 07:21:18 PST)

It is inexspensive and seems to work, athough i cant guarantee the level of protection it gives. It has a long turn on delay time ~12 seconds. I might try to modify some component values to shorten the time. So it at least offers turn on dealy and speaker disconnect at power off.
  Reply With Quote
Old 2nd February 2011, 09:13 AM   #580
diyAudio Member
 
Join Date: Nov 2009
Thanks for the info Ruwe and Flappytango.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
GB - F5 Clone suds Group Buys 3 23rd August 2010 01:03 PM
Tube Preamp 'Clone' PCB copys on ebay (Marantz, McIntosh, etc) powertriode Tubes / Valves 57 11th August 2007 07:59 PM
Question regarding ProAc 2.5 Clone and Tempo 2 Clone zoooh Multi-Way 5 11th March 2003 08:19 PM


New To Site? Need Help?

All times are GMT. The time now is 01:40 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2