Julian Vereker (the founder of Naim and the original designer of their amps) supposedly adjusted those values by ear. Lore has it that it was to make the top and bottom phase-consistent.
So if you drink the Kool Aid, at least he could hear the difference. Or, maybe he did it just to even out the idle current.
Hard to know as cancer took him before he gave away many of his secrets....
So if you drink the Kool Aid, at least he could hear the difference. Or, maybe he did it just to even out the idle current.
Hard to know as cancer took him before he gave away many of his secrets....
Hi again,
I tested a few different kind of caps with the same value in my chinese kit. My decision is that;
C7 (in my diagram) is tantal 10uf (they send 10uf elect.),
C10, tantal 100uf (they send 100uf elect.)
C5, elect. 47uf (I'm not satisfied from tantal.They send 47uf elect. I used it)
Diagram is which was send to me, values are mirror
If you comment I will be gratefull.
View attachment NCC250.pdf
I tested a few different kind of caps with the same value in my chinese kit. My decision is that;
C7 (in my diagram) is tantal 10uf (they send 10uf elect.),
C10, tantal 100uf (they send 100uf elect.)
C5, elect. 47uf (I'm not satisfied from tantal.They send 47uf elect. I used it)
Diagram is which was send to me, values are mirror
If you comment I will be gratefull.
View attachment NCC250.pdf
I find a note for C3, 47pf cap, "Start with 100 pF VAS cap and work down ( scope required ) . Use COG/MPO ceramic or silver mica ( all sound good although other ceramics usually not ) .Never use polystyrene although sonically excellent .It will let go eventually and take your speakers out . Surface mount 1205 types can be excellent ." nigel pearson nap140 comments
I disagree with using silvered mica. They corrupt the signal.
I have never had a polystyrene “let go” in 40 years.
Capacitor construction is really important. You’ll notice that the Naims use a lot of solid tantalums and polystyrenes in the signal path. They do not use electrolytics paralleled with ceramics.
There are a lot of well-intentioned enthusiasts out there who think they can improve the Naim by making circuit changes that seem sensible to them. Vereker was not a naive man. On the contrary, his understanding of complex systems led to this deceptively simple design.
There are a lot of well-intentioned enthusiasts out there who think they can improve the Naim by making circuit changes that seem sensible to them. Vereker was not a naive man. On the contrary, his understanding of complex systems led to this deceptively simple design.
