Simplistic NJFET RIAA - Page 58 - diyAudio
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Old 5th January 2009, 09:19 PM   #571
RCruz is offline RCruz  Switzerland
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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
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Old 7th January 2009, 11:14 AM   #572
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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.
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Old 7th January 2009, 03:40 PM   #573
Salas is offline Salas  Greece
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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.
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Old 7th January 2009, 07:09 PM   #574
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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...
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Old 7th January 2009, 07:21 PM   #575
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Default Row PSU

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 ?
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Old 7th January 2009, 07:26 PM   #576
es44 is offline es44  Denmark
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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
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Old 7th January 2009, 10:12 PM   #577
Salas is offline Salas  Greece
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Default Re: Row PSU

Quote:
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.
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Old 7th January 2009, 10:14 PM   #578
Salas is offline Salas  Greece
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Quote:
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.
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Old 8th January 2009, 08:13 AM   #579
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like this
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Old 8th January 2009, 08:23 AM   #580
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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)
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