Simplistic NJFET RIAA

[RCruz]

Hi Salas

This mod was awesome.... thank you so much..

Now I have 464 ohm Welwyn precision metal film in place of the stock 1k in series.

Adding the benefits of no ceramic in parallel, the 27k RC55Y load seams very good indeed.

There is a lot of detail (less distortion) and attack in the transients and the gain in dynamics is outstanding.

I am already imagining what a direct link could do.....

The strings are now really lifelike.

I really need a jfet riaa.... it will show what the benz can do.

I am amazed.

Ricardo

[kstlfido]

Salas and nicoch46-

Haven't had a chance to mod more, I've been busy listening to more vinyl...this is addictive! I'll probably try the Elna's for all the 'lytics (power and bypass) as the BG's are not in the range I want (and rather pricey).

Why do you recommend a NP for the source bypass?

I might try an AN tant for the load. I'll stick to the PRP's for other R's.

I took my (tired) pre out of the chain and a whole veil has been lifted..surprising! I now hear more subtle changes to VTA, etc. Good solid bass, too. Just can't play it late as it's plenty loud... Need to build one of those lightspeed attenuators next.

[Salas]

You see? You did well in the end. Happy for you.
I find the BG NP open and nice there, that is why I recommended them. But it is always a total system fine tuning thing. It may go contrary to something easily. It is a bit like cooking. You better have a gamut of good ingredients and apply by experiment. But you mention it is loud enough already. Are you sure that you need the extra gain? If not, better avoid, because best cap is no cap.

[nicoch58]

for what I read for psu caps nichicon KG ,gold or the better super

are used by jcarr and JCurl-Crump .....with 0.1u RT bypass and harris for diode (or Fairchild Stealth more soft )

tant series give more...

[nicoch58]

HI salas

to improve the psu better dual caps with small resistor between , or between diode fist caps ?
or go for coil ?

X2 0.1u caps on secondary before diode ?

[es44]

Salas, i owe You a cold one

Thanks a lot for the friendly push. After our little "talk" yesterday i couldn't resist trying again, and now i have a nice shunt working.

It draws >250mA, and only gives 22.5 volts, but i noticed my 12V zener actually opened at 11.2V, so i guess it's not too far off.

Again, thanks a lot for sharing this with us. Now i can move on to the RIAA

[Salas]

Originally posted by nicoch46
HI salas

to improve the psu better dual caps with small resistor between , or between diode fist caps ?
or go for coil ?

X2 0.1u caps on secondary before diode ?

Coil between dual caps, soft fast diodes, no small caps.

[Salas]

Originally posted by es44
Salas, i owe You a cold one

Again, thanks a lot for sharing this with us. Now i can move on to the RIAA

You are welcome. Try another Zener sample closer to spec.

[nicoch58]

like this

[nicoch58]

half way ,
if we put a small panasonic resistor with some induttance, similar in Pass design ??

PS photo are only for +/- PSU ,for NJFET RIAA we need only HALF
fist pic are inductive psu, coil hammond 159s 22€(remenber x0,9 not 1,41)