This is a kit,need to solder the parts by yourself.

NAP250MOD

It is base on the nap250 by LJM and an improved version.

Compared with Naim nap140 200, the performance is better and the price is lower.

LJM does not provide circuit diagrams for all products, do not mind buying

Nap250 mod version adopts mini circuit board design scheme to reduce the length of PCB wiring.

It also reduces the resistance influence of PCB wiring.

The shorter the PCB copper wire, the smaller the resistance and the performance will be improved.

In addition, some bugs of the original factory have been modified in the nap250 mod version. The temperature compensation tube can be installed on the same radiator as the high-power tube.

In this way, nap250 mod can work in class AB.

Crossover distortion is avoided.

And several other obvious bugs of the original factory.

Therefore, the effect of nap250 mod is better and more cost-effective than the original copy.

The high-power transistor adopts four original imported st Italian semiconductor 2sc5200

230v15a 150W power TRANSISTORS.

The weight of two dual channel boards is 100g,

Operating parameters:

The supply voltage is DC + - 15V to DC + - 40V.

Output power = RMS 80W 8R (DC + - 40V)

Recommended value of static current: voltage at both ends of cement resistance = 1.5 mv-3mv

The current is about 10-20 ma.

THD+N=0.001%-0.03%（20HZ-20KHZ 5W-30W 8OHM Audio Precision 2 TEST）

 

---

On Sep-12-21 at 06:21:08 PDT, seller added the following information: