Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

NAP-140 Clone Amp Kit on Ebay
NAP-140 Clone Amp Kit on Ebay
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 14th September 2018, 03:06 PM   #3201
traderbam is offline traderbam  Europe
diyAudio Member
 
traderbam's Avatar
 
Join Date: Jan 2002
Location: Earth
Quote:
Originally Posted by drmaftoon View Post
Thank you so much for your kindness. Can I ask what ZTX part you are referring to ? This board is using ZTX 753 and 653 already?
I have ordered BUV20 NOS from USA, hopefully they would not be fake. I will order rest of the parts as per your advice and report back.

Regards
Maybe not a ZTX but an MPSA06 in E-line package. Ian Finch may have more to say on what Naim uses here in different variants. The BC part is fine here, a BC550C better for noise.
__________________
Everything matters.
  Reply With Quote
Old 14th September 2018, 03:09 PM   #3202
drmaftoon is offline drmaftoon  United Kingdom
diyAudio Member
 
Join Date: Jan 2018
Location: Lincolnshire United Kingdom
Quote:
Originally Posted by traderbam View Post
Maybe not a ZTX but an MPSA06 in E-line package. Ian Finch may have more to say on what Naim uses here in different variants. The BC part is fine here, a BC550C better for noise.
I agree, I recently opened up my original NAP 200 and it has MPSA06 installed. I have them in my drawer, which transistor should I substitute in schematic for MPSA06 ?
thanks
  Reply With Quote
Old 14th September 2018, 03:16 PM   #3203
traderbam is offline traderbam  Europe
diyAudio Member
 
traderbam's Avatar
 
Join Date: Jan 2002
Location: Earth
Quote:
Originally Posted by drmaftoon View Post
I agree, I recently opened up my original NAP 200 and it has MPSA06 installed. I have them in my drawer, which transistor should I substitute in schematic for MPSA06 ?
thanks
Go authentic! MPSA06.
It's great that you own a NAP 200 so you can compare directly.

The NAP200 looks like it uses a single rectifier bridge and centre-tapped transformer output per channel. That's fine too of course. I happen to use two separate transformers with my amplifier, each with dual secondaries which I feed to two bridges and then the smoothing caps.
Attached Images
File Type: jpg NAP200.jpg (428.5 KB, 125 views)
__________________
Everything matters.
  Reply With Quote
Old 14th September 2018, 03:20 PM   #3204
drmaftoon is offline drmaftoon  United Kingdom
diyAudio Member
 
Join Date: Jan 2018
Location: Lincolnshire United Kingdom
Quote:
Originally Posted by traderbam View Post
Go authentic! MPSA06.
It's great that you own a NAP 200 so you can compare directly.

The NAP200 looks like it uses a single rectifier bridge and centre-tapped transformer output per channel. That's fine too of course. I happen to use two separate transformers with my amplifier, each with dual secondaries which I feed to two bridges and then the smoothing caps.
so just to confirm BC546 should be replaced with MPSA06 ?
I am sorry I am asking to omany questions, but I am a novice and I love playing with things as long as there is no smoke
  Reply With Quote
Old 14th September 2018, 03:21 PM   #3205
traderbam is offline traderbam  Europe
diyAudio Member
 
traderbam's Avatar
 
Join Date: Jan 2002
Location: Earth
Yes, the current source transistor Q8 should be MPSA06
__________________
Everything matters.
  Reply With Quote
Old 14th September 2018, 03:27 PM   #3206
traderbam is offline traderbam  Europe
diyAudio Member
 
traderbam's Avatar
 
Join Date: Jan 2002
Location: Earth
On an unrelated note, for Ian and Gareth and all, I just came across this: Online Tone Generator - generate pure tones of any frequency

It is a simple online tone generator whose frequency can be adjusted with a slider. You can change the L R balance too. I was just feeding this through my audio system, which is attached to a PC, and found it very simple and effective for finding resonances in the room and speakers too. I found a rattle at 218Hz that I'm now working on. I also found I had to open a cabinet door to stop it "singing along".
Little things like this can affect your musical enjoyment and are cheap to remedy.
__________________
Everything matters.
  Reply With Quote
Old 14th September 2018, 03:54 PM   #3207
huggygood is offline huggygood  France
diyAudio Member
 
Join Date: Mar 2011
Location: france (bretagne)
Quote:
Originally Posted by traderbam View Post
Not everything that is expensive is bad. In audiophile culture, the source end is more important than the motor end. A mediocre DAC really costs you a lot of sound quality but I am rather out of touch about what are decent DACs these days. I bought a ML 39 many years back and it has been the best investment I have made for my music.
+1
I still have a bryston 4B that I love and some C-Audio are muscular versions of these English amps so musical
  Reply With Quote
Old 14th September 2018, 05:45 PM   #3208
traderbam is offline traderbam  Europe
diyAudio Member
 
traderbam's Avatar
 
Join Date: Jan 2002
Location: Earth
Here's a UK seller of esoteric capacitors and other goodies. I've bought one or two things from here such as Mundorf caps. Mostly I use Farnell and Mouser.
Amplifier valve kits, HIFI pre-amplifiers, speaker kits, AMP Parts, upgrade components | Hifi Collective
__________________
Everything matters.
  Reply With Quote
Old 14th September 2018, 06:02 PM   #3209
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, NSW
The NAP 200 is actually dual mono - well, electrically dual mono at least. There are 2 sets of 28-0-28V windings, two bridge rectifiers and 2 pairs of electrolytics plus a 12-0-12V winding and electrolytic for the 24V preamp supply. It's quite a breath of fresh air and a more practical, modern and advanced PCB design approach to previous ones which were not exactly the latest tech. It's also by far the best clone to build provided you build it right in a suitably heavy case and provide for extra heat dissipation with a 25 x 6mm section heat spreader bar. I found the rubber isolation board mounting unnecessary but if you work your audio system hard, it could be quite beneficial.

As said earlier, the Zerozone kit is a poor show - it needs a comprehensive review of the parts types with a schematic in hand, which you can find at #1825 in this thread - a great reverse-engineering effort by member Algar-emi.
NAP-140 Clone Amp Kit on Ebay
__________________
If only I had listened....
  Reply With Quote
Old 14th September 2018, 10:48 PM   #3210
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
NAP-140 Clone Amp Kit on Ebay
Quote:
Originally Posted by traderbam View Post
Not everything that is expensive is bad. In audiophile culture, the source end is more important than the motor end. A mediocre DAC really costs you a lot of sound quality but I am rather out of touch about what are decent DACs these days. I bought a ML 39 many years back and it has been the best investment I have made for my music.
I do believe the earlier DACs that were expensive were far better than the lower cost ones. There have been a lot of advances in DAC chip engineering since then and some companies have done much to take advantage of this e.g. Schitt. Their stuff looks good although I haven't auditioned it.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote

Reply


NAP-140 Clone Amp Kit on EbayHide 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

Forum Jump

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 07:53 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki