NAIM NAIT 2 DIY

[Oleg Turbin]

Transformer is a heart of amplifier

 

[Oleg Turbin]

Size for NAP amps

 

[Oleg Turbin]

My board is derived from the classic NAC72 circuits but with split and dual supplies - so it becomes essentially a 552 (non-DR) that is essentially a 52 with split / dual rails... So yes, it has the classic Naim sound.

I know the original Naim sound because I owned many of them (up to 500 series level)...

Good day
Your diy the NAC72 some like this one ?

P.s
“..You have the Naim?
… yes!!
..What model ?
…paper fu..ing..”

 

[huggygood]

It would make a very pretty framed photo for my workshop or even my living room !

 

[Oleg Turbin]

100%
Few months of working …

Also I make the control board for NAP140 amp with digital volume control

 

[jpk73]

No, see here...

 

[Oleg Turbin]

My friend Stas have a NAC82 and hi say
The NAC82 have a better sound than NAC3/6/72
About four years ago I buy the NAC42 and NAC32.5 and his preamps have a different sound too.

 

[Oleg Turbin]

It would make a very pretty framed photo for my workshop or even my living room !
View attachment 1244634

Comment under this Art
“Oleg Turbin and Julian Vereker rebuilding of old amps “

 

[Oleg Turbin]

No, see here...

Great work my friend !!!
This is new way is a 552 preamps building
You use the relay volume control ?

 

[jpk73]

Yes, with reed relays...

 

[Oleg Turbin]

This is better than Alps ?

 

[Oleg Turbin]

Control board for preamp
Microcode for PGA2310/11

 

[Oleg Turbin]

My next Shoebox Amplifier

 

[Oleg Turbin]

Third Shoebox Amp with more power out

Bass testing

 

[zincho]

I'm perfectly aware of that but I have an ailing NAC112 preamp board with all the CPU controlled functions and CMOS switches and I may not be able to fix it.
For what Naim USA charges for service I could buy two of those preamps from Ebay but I don't need another box. Since the pre is shot and
also it doesn't have typical Naim sound the easiest way would be to save the switching ability and remote control and fit another board hopefully a better one because it's was the cheapest Naim and purposely handicapped to fit their product hierarchy

I have a NAC112 that fell into the water. I bought it like this. I didn't throw it into the water. Cleaning and repairing was difficult, so I redraw the PCB from scratch, referring to the NAC82's PCB. Looks good. Most parts are from the original NAC112. Controller using the original NC112.

 

[limono]

Uh , it's a beau !
Too bad you got fooled with all that nonsense with Naim Cap - ism and didnt fit a power transformer and regs inside.

 

[Oleg Turbin]

I have a NAC112 that fell into the water. I bought it like this. I didn't throw it into the water. Cleaning and repairing was difficult, so I redraw the PCB from scratch, referring to the NAC82's PCB. Looks good. Most parts are from the original NAC112. Controller using the original NC112.
View attachment 1299931

Good day
Dear Zincho
Great Work!!!!
I think this design is better than 112

 

[Oleg Turbin]

Uh , it's a beau !
Too bad you got fooled with all that nonsense with Naim Cap - ism and didnt fit a power transformer and regs inside.

Good day
Dear Limono
why do you think so ?
external power supply is not nonsense
they're just all different

 

[zincho]

Good day
Dear Zincho
Great Work!!!!
I think this design is better than 112

Oh, thank you for your confirmation. Maybe better than the original NAC112. To keep the original appearance intact, I made as few changes as possible. Perhaps it would be better to use multiple power supplies. Originally I used 4 resisters in place of the 10K balanced potential, but this introduced interference, so I gave up. I don't know if it's the right thing to drop the balance pot?

The original NAC112 core section used a+15V power supply with the input buffer stage with a DC servo circuit. The volume section uses a network of many transistors and MOS switching chips, and I'm sorry to be less professional. Regardless, NAC112 is a special presence in the NAIM preamp. Don't understand what their design intentions are.

 

[Oleg Turbin]

Don't understand what their design intentions are

I think need ask a Roy George about this


All old preamp worked at + 24volts external power supply