Another nap 140 clone question

[phf36guzzi]

I see that most of the nap 140 clone kits use real or fake 2sc3858 sanken transistors, but genuine nap 140s use 2sc2922 transistors are these two types of transistors similar? would it be a good idea to fit genuine sankens from the start ? if so which one? thanks in advance, I don't understand electronics theory but I like jigsaws.🙂

 

[2 picoDumbs]

In my opinion most of the magic is in the circuit as a whole. As long as the output devices meet the necessary power requirements and have similar linearity to the originals then there are probably several transistor options that will do the job.

 

[Ian Finch]

Over the decades of production, the original design used BDY58, 2SC2922 and proprietary types NA001 and NA002 for output transistors - very different devices. Get the picture?
This topic was also recently covered again in the big NAP140 thead here and it applied to most larger Naim models over the decades of production as you see detailed here: Modifying Naim Audio power amplifiers
You might also want to think about the vast difference in price between the original products and any of the NAP140 PCB clone kits still on offer before getting over-concerned about semis. If genuine parts quality is your mission, the more important choices are to be made in the VAS which does affect sound quality markedly - elsewhere not so critical.

 

[phf36guzzi]

thankyou

thankyou for your advice, I think I will stick with my poorly audio note oto, see you on the other side (valve forum) thanks again🙂