View Full Version : Battleship NAP180


misterc6
10-02-09, 04:51 AM
I didn't believe it could be done but here is my NAP180 complete with 2 x CAP6 and a 700 VA transformer giving 50 volt power rails:

http://picasaweb.google.com/misterc6mg/Pfm?pli=1&gsessionid=bFrdmkebQICHZjlYKvwEPQ&feat=directlink

It all went in quite easily. Many thanks to LesW for his advice and putting up with my 'phone calls.

How does it sound? Blooming marvellous! I'm hearing things in familiar recordings that I never knew were there and, best of all, it's retained the Naim sound.

malcolm

flatpopely
10-02-09, 05:06 AM
I bet that is ace!

zener
10-02-09, 05:20 AM
and heres one that used a NAP250 and goes a stage further:D , but with a Mini cap module
http://i141.photobucket.com/albums/r51/fluffvogel/100_0108.jpg

YNWOAN
10-02-09, 05:33 AM
What's the difference then between the Mini Cap module and the ones in the Nap180 pictured?

flatpopely
10-02-09, 05:40 AM
and heres one that used a NAP250 and goes a stage further:D , but with a Mini cap module
http://i141.photobucket.com/albums/r51/fluffvogel/100_0108.jpg

......and a stage further.......(but no NCC200s)

http://i178.photobucket.com/albums/w258/Andrew_Popely/Hi%20Fi/ZAP250/092.jpg

misterc6
10-02-09, 05:43 AM
What's the difference then between the Mini Cap module and the ones in the Nap180 pictured?

To the best of my knowledge the MiniCap6 is much smaller and uses fast recovery diodes rather than Schottky diodes. Not sure about it's capacitors, the CAP6 has 6 x 5600 uF.

LesW or Zener will be able to tell you more.

malcolm

misterc6
10-02-09, 05:44 AM
I bet that is ace!

Oh YES!!!

malcolm

337alant
10-02-09, 09:47 AM
Very nice Malcolm ;)

misterc6
10-02-09, 09:55 AM
Very nice Malcolm ;)

Thank you kind sir! It's my first project after a 15 year layoff and I've got the bug again!

trancera
10-02-09, 12:59 PM
That looks like the new Full Cap6 but with low profile caps to fit, nice job!

Mines the same traffo but has minicaps ... someone always rains on your parade dont they?

Well done Malcolm, certainly a neater job than mine. Time for an update I think!

misterc6
10-02-09, 01:16 PM
That looks like the new Full Cap6 but with low profile caps to fit, nice job!

Mines the same traffo but has minicaps ... someone always rains on your parade dont they?

Well done Malcolm, certainly a neater job than mine. Time for an update I think!

Thanks for that. I think that these are the full size CAP6s not the new low profile. Look at the height of the caps above the diode heatsink and then compare with the pics on the Avondale site - that's why I was amazed that they fitted!

malcolm

a.palfreyman
10-02-09, 01:23 PM
Thank you kind sir! It's my first project after a 15 year layoff and I've got the bug again!

Dangerous tendencies!!

Nice work.

Best,
AP

Nic Robinson
12-02-09, 05:38 AM
......and a stage further.......(but no NCC200s)

http://i178.photobucket.com/albums/w258/Andrew_Popely/Hi%20Fi/ZAP250/092.jpg

That's what I've got.

:D:D

flatpopely
12-02-09, 05:56 AM
That's what I've got.

:D:D

Replace the feedback caps, well worthwhile!

Jo Sharp
12-02-09, 09:07 AM
Very neat job Sir!

Feedback cap is a good next move....and NCC200s would be the icing on the cake in due course.

hacker
12-02-09, 09:14 AM
Very nice Malcom :) You can optimize your wiring slightly by taking the loudspeaker 0V wires (blue) directly to the noisy end of the CAP6 boards. This reduces impedance by having the loudspeaker 0V snug against the transformer centre-tap (black wires) without the loudspeaker return current needing to travel through the CAP6 tracks first.

Cheers,
Carl

misterc6
12-02-09, 09:37 AM
Very nice Malcom :) You can optimize your wiring slightly by taking the loudspeaker 0V wires (blue) directly to the noisy end of the CAP6 boards. This reduces impedance by having the loudspeaker 0V snug against the transformer centre-tap (black wires) without the loudspeaker return current needing to travel through the CAP6 tracks first.

Cheers,
Carl

Thanks Carl, I had seen one similar amp wired the way you suggest. I'll give it a try!

malcolm

stackowax
12-02-09, 11:33 PM
Don't suppose you have a "before" picture do you?

I didn't believe it could be done but here is my NAP180 complete with 2 x CAP6 and a 700 VA transformer giving 50 volt power rails:

http://picasaweb.google.com/misterc6mg/Pfm?pli=1&gsessionid=bFrdmkebQICHZjlYKvwEPQ&feat=directlink

It all went in quite easily. Many thanks to LesW for his advice and putting up with my 'phone calls.

How does it sound? Blooming marvellous! I'm hearing things in familiar recordings that I never knew were there and, best of all, it's retained the Naim sound.

malcolm

misterc6
13-02-09, 12:17 AM
Don't suppose you have a "before" picture do you?

This should link you to an album of photos chronicling the rebuild process:

http://picasaweb.google.com/misterc6mg/Battleship180?feat=directlink

malcolm

CRN
13-02-09, 01:00 AM
Hi Malcolm,
Nice job you have made of this rebuild. When you knocked up the Cap 6 Modules did you use Les to source your components or did you just know what component went where?
Also the feedback cap and input cap, what components have you used?
Did you use Avondale to source the 700v Toroidal transformer and was it an R core type.
Sorry about all the questions, it's just that this type of project interests me!!
Lastly, what sort of costs were involved in carrying out the upgrade?
Thanks Chris

misterc6
13-02-09, 01:15 AM
Hi Malcolm,
Nice job you have made of this rebuild. When you knocked up the Cap 6 Modules did you use Les to source your components or did you just know what component went where?
Also the feedback cap and input cap, what components have you used?
Did you use Avondale to source the 700v Toroidal transformer and was it an R core type.
Sorry about all the questions, it's just that this type of project interests me!!
Lastly, what sort of costs were involved in carrying out the upgrade?
Thanks Chris

Thank you for your kind comments Chris. I bought the CAP6s ready made from Les. I'm not sure if he sells bare pcbs for these.

So far I have changed the input cap to a 10 uF, 25V BC128 solid aluminium. The existing feedback cap is a 100 uF, 10V tant which I am thinking of changing to a Kemet military spec metal cased one.

The transformer is indeed from Les at Avondale and is toroidal - take a look at the photos I posted earlier this morning.

I took my time over the build but it could easily be completed in a day.

I don't think it is right for me to comment on cost here except to say that the improvement is stunning and worth every penny! Get on the 'phone to Les and talk it over with him.

malcolm

misterc6
13-02-09, 10:09 AM
I don't think it is right for me to comment on cost here except to say that the improvement is stunning and worth every penny! Get on the 'phone to Les and talk it over with him.

malcolm

At least one of my friends and I rate the 180 as more musical and definitely better value than the 250. These mods take the 180 to another level without losing its musicality. It's like lifting several veils off the music; the grip on the speakers is immense and the ability to identify individual instruments is superb.

The Naim boards really come alive when you increase the rails to 50V and you'd be hard pressed to do that with the regulator boards in the 250.

You can pick up a good used 180 for around 425, add in the cost of mods described plus a couple of fresh tantalums and you'll have a brand new super amp plus change from the price of an average second hand olive 250.

If you're reaching for your keyboard please don't hijack this thread into a 180 vs 250 argument. This is just my subjective, humble opinion! One man's meat is another man's poison!

malcolm

mega lord
14-02-09, 03:55 AM
Hi Malcolm.

Excellent work and a very good choice you have made IMO.

I remember well the improvements brought when replacing the Naim PSU boards with minicaps in my 140's.

Like you i have kept the Naim amp boards and have the same input coupling cap as you. The feedback tant i replaced with a 47uf Evox MMK on flying leads as they are quite big. The bias tant i replaced with an oscon but i dont know what if any improvement this has brought.

I still use the original transformers. Maybe one day i will experiment here.

I use two 140's as monoblocks with left and right channels having totally seperate transformers and minicaps in their own cases. I can't recommend highly enough the change that this brought. Jaw dropping etc etc.

Eventually i may try the NCC200 boards and relegate the Naim boards to a second system.

stu

stu

misterc6
14-02-09, 12:59 PM
Hi Malcolm.

Excellent work and a very good choice you have made IMO.

I use two 140's as monoblocks with left and right channels having totally seperate transformers and minicaps in their own cases. I can't recommend highly enough the change that this brought. Jaw dropping etc etc.

Eventually i may try the NCC200 boards and relegate the Naim boards to a second system.

stu

stu

Seems like we're headed in the same direction. I just bought another pair of Naim boards from Les on eBay and have two pairs of transformers (see my thread on cheap transformers at Farnell) with a view to building monoblocks. Even though I'm in love with the Naim sound I would like to try the ncc200 sometime - anyone live close enough to Pembrokeshire for me to have a listen?

malcolm