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NAP-140 Clone Amp Kit on Ebay
NAP-140 Clone Amp Kit on Ebay
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Old 15th October 2018, 09:29 PM   #3341
JimSalabim is offline JimSalabim  Germany
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Join Date: Dec 2017
OK folks. Thanks to your help and advice I have successfully finished my NAP 200 clone. Offset on both channels is around 7Ė8 mV each, I guess thatís fine then.
The transformer is custom made from Tiger in the UK.
I have added a three way switch to switch the PCB ground from floating directly to the chassis or to the chassis via two diodes in reverse and a 10W resistor. My first impression was that only the floating option gave a tiny little bit of hum and both others no hum at all. But I wasnít able to listen closer yet, because there is a problem with one of my preamp PCBs (NAC-42 clone). I have already contacted the seller. The left channel works great, the right one is accompanied by hiss and noise. Itís definitely somewhere on the preamp PCB of this channel, I ruled everything else out.
But the NAP 200 works great.
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Old 16th October 2018, 08:33 AM   #3342
Ian Finch is offline Ian Finch  Australia
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Location: Coffs Harbour, NSW
Congratulations. It's quite a big project but a well-built clone sounds superb, I think. You appear to have taken the right steps to mounting the semis but I'm not sure about the thin sheet of aluminium under the PCB. What is this for? Normally, you only need a bar of about 25x4 to 30x5mm that fits within the large PCB slot as a heat spreader between transistors and the case. Of course, a thick aluminium case is essential to use the amplifier at medium to high power, as with all Naim designs.

You will need to add some heatsink grease between bar and case to ensure good thermal contact - where it is most needed. A finishing touch is a plastic cover (anything from the junkbox that fits) over the input transistor pair, as you see in pics of the original. I simply used a discarded cover from an HDMI connector.
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Old 16th October 2018, 08:52 AM   #3343
traderbam is offline traderbam  Europe
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Quote:
Originally Posted by JimSalabim View Post
OK folks. Thanks to your help and advice I have successfully finished my NAP 200 clone.
Congratulations. Looks neat and tidy.
I think I see a shield connection on your transformer too, nice. What made you choose: Tiger?
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