Simplistic NJFET RIAA - Page 835

Salas · 24th October 2012, 06:28 PM

As I had wrote before when we were discussing the Miller reduction effect, it won't be perfect in real life with just the Vds provided by common gate JFET on top. That is why I was suspicious about the simulator precisely predicting the HF Riaa cap on single shot with the rather coarse JFET spice models. You should listen in stereo with best cart available and take some time of course.

RCruz · 24th October 2012, 06:38 PM

Soon I will finish second board and than I will have the pleasure to fine tune it with the Benz cart.

Yes, it is a D3000... how did you know?

And yes, the output cap is the "missing link" so I will go blue in time.

There are also upgrades coming the V12R way off course

In the end I will do a double mono psu with r-cores.

Salas · 24th October 2012, 06:44 PM

The exercise is we ball park a safe HF cap value to recommend. Then each builder will have tonal influences from his cart, arm, set up, chosen caps, regs, etc. But there must be something to be based at.

About the camera, EXIF data told me. I was wondering if its just your own outdoors shots or a coincidence, that is why I asked. The birds are not that historically appreciating by the way.

Salas · 24th October 2012, 06:52 PM

P.S. We don't know the exact value when on less than professional 4 wire bench LCRs like HP lab gear anyway.

atupi · 12:28 PM

As everybody recommending teflon for the 47nf interstage capacitor i've found a cheap and easy way to source some 22nf FT-1 teflons. Would be a good idea to buy 4 of them and install paraleled ?

For the 47nf in the RIAA network polystyrene would be good ?

merlin el mago · 25th October 2012, 01:01 PM

For RIAA most importatnt is accuracy if you get 1% better

Salas · 25th October 2012, 01:06 PM

Quote:

Originally Posted by atupi

As everybody recommending teflon for the 47nf interstage capacitor i've found a cheap and easy way to source some 22nf FT-1 teflons. Would be a good idea to buy 4 of them and install paraleled ?

For the 47nf in the RIAA network polystyrene would be good ?

Yes & yes.

Salas · 25th October 2012, 01:10 PM

Quote:

Originally Posted by merlin el mago

For RIAA most importatnt is accuracy if you get 1% better

Most important is you home in to a curve that compliments your system. If not having 1% LCR or better and many components to match from, safer is getting 1% components to a generally agreed and recommended value.

MASantos · 27th October 2012, 02:08 AM

Salas have you tried using the lsk170 instead of the 2sk ones?

Salas · 27th October 2012, 04:17 AM

No. They should be adequate I have read though.

24th October 2012, 06:38 PM	#8342
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	Soon I will finish second board and than I will have the pleasure to fine tune it with the Benz cart. Yes, it is a D3000... how did you know? And yes, the output cap is the "missing link" so I will go blue in time. There are also upgrades coming the V12R way off course In the end I will do a double mono psu with r-cores. __________________ RC

25th October 2012, 12:20 PM	#8345
atupi diyAudio Member Join Date: Oct 2010 Location: Bucharest	As everybody recommending teflon for the 47nf interstage capacitor i've found a cheap and easy way to source some 22nf FT-1 teflons. Would be a good idea to buy 4 of them and install paraleled ? For the 47nf in the RIAA network polystyrene would be good ? Last edited by atupi; 25th October 2012 at 12:28 PM.

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24th October 2012, 06:28 PM	#8341
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	As I had wrote before when we were discussing the Miller reduction effect, it won't be perfect in real life with just the Vds provided by common gate JFET on top. That is why I was suspicious about the simulator precisely predicting the HF Riaa cap on single shot with the rather coarse JFET spice models. You should listen in stereo with best cart available and take some time of course.

24th October 2012, 06:44 PM	#8343
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The exercise is we ball park a safe HF cap value to recommend. Then each builder will have tonal influences from his cart, arm, set up, chosen caps, regs, etc. But there must be something to be based at. About the camera, EXIF data told me. I was wondering if its just your own outdoors shots or a coincidence, that is why I asked. The birds are not that historically appreciating by the way.

24th October 2012, 06:52 PM	#8344
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	P.S. We don't know the exact value when on less than professional 4 wire bench LCRs like HP lab gear anyway.

25th October 2012, 01:01 PM	#8346
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	For RIAA most importatnt is accuracy if you get 1% better

27th October 2012, 02:08 AM	#8349
MASantos diyAudio Member Join Date: May 2005 Location: Lisbon Portugal	Salas have you tried using the lsk170 instead of the 2sk ones?

27th October 2012, 04:17 AM	#8350
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No. They should be adequate I have read though.