NAP250 clone

[Oleg Turbin]

500DR

 

[jpk73]

I prefer non-DR. We can always add discrete regulation later on!

 

[mdardeniz]

47pf for Miller is a lot
Try use about 39pf
Also ceramic caps is not good for sound

This is my old design. But, miller has still 47pf. I have no 39pf Styroflex cap.

 

[Oleg Turbin]

My friend make DIY film caps
Polypropylene with oil with paper with cuprum foil

I ask him about 39pf DIY

https://flic.kr/p/2mCp8nW
On photo 470pf and 220pf caps

 

[Oleg Turbin]

I start building the NAP250 CB amp boards

 

[Oleg Turbin]

And video

 

[jpk73]

Great!! What capacitor did you use here:

 

[Oleg Turbin]

Old film same with NAP110 CB
On caps not print brand

 

[jpk73]

Where did you buy it?

 

[Oleg Turbin]

Old stock from SPeterburg trader

Progress of building

 

[jpk73]

Why use green film caps? You can easily get styrene caps...

 

[VivaVee]

Great!! What capacitor did you use here:

View attachment 1210434

this is a stacked film PET capacitor from the 1980s

 

[jpk73]

What would be the closest modern replacement?

 

[huggygood]

Siemens i think

 

[VivaVee]

KEMET R82 or WIMA MKS2 or TDK/EPCOS B32529 series (assuming a 5mm pitch)

 

[Oleg Turbin]

Also don’t forget about preamp

 

[cristobool]

Great work Oleg with the preamp too what are your PCBs ?

 

[huggygood]

home made

 

[Oleg Turbin]

Great work Oleg with the preamp too what are your PCBs ?

NAC42.5 DIY

 

[Oleg Turbin]

And NAP140 or NAP110/250 CB

The NAP110/250 CB amp boards I finished after get the BDY56 transistors

NAP140/250 Olive amp board in attachment