Simplistic NJFET RIAA - Page 578 - diyAudio
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Old 21st January 2011, 09:12 PM   #5771
le´flu is offline le´flu  Germany
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Well Salas, what was it that you did not like about Wimas?
Yes, you´re right, it all depends on the system. A friend of mine who has
a really good diy system, all valve uses wima mkp4. and i know his system
for a long time and mostly twice a year i go to him with the new so called best
cap....but always this f...... red cap wins - even better than those expensive
mundorf oil thingies. Okay my setup is quite different and i´ll try your sugges-tions. What brand do you like in RIAA network?
I use 100r because you put it in the circuit. But i left it in sockets on the pcb
so i can change the load res.
I have 220r and 470r around and will stick them in at the weekend.
Did you ever played with capacitive load on MC Systems?

Greetings Ulf
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Old 21st January 2011, 09:49 PM   #5772
Salas is offline Salas  Greece
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I found them distinctly veiled and artificial. Pinched without punch and flat. SCR simple grade was better enough, Tin Foil worse of all, really dark. Auricap and Mundorf much better. Teflon only best, reminding DC coupling. K40-Y and K75 very good, great when Teflon bypassed. Vishay MKP 1837 I find good for Riaa and NOS Polysterene too. Dorian gives 10R source impedance so 100R is typically OK, but we would not know if 220R or 470R can fair better in real life without a test. I have found extra load capacitance rounding off MC carts non naturally sometimes that I have tried. There are models like those from EMT that require it I have read though.
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Old 22nd January 2011, 05:15 AM   #5773
le´flu is offline le´flu  Germany
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Hi Salas,
well thats really funny to read because my sense while listening was
opposite to yours concerning the sound of wimas (well my experience
with cap-comparison where at my friends system). Wimas where
allways the ones with open more fluent and detailed sound. I never
thought that there must be so much of synergy within the system.....
By the way, what are your system components you compared the caps
with? My friend system is Audioplan contrast (heavily moddified), LA-
audio pushpull 6550, and LA audio pre-clone with e83cc. DAC is PSaudio.

Greetings Ulf
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Old 22nd January 2011, 10:14 AM   #5774
RCruz is offline RCruz  Switzerland
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Hi Ulf

After you experiment with cart load and reduce the 15n cap (IMO micas are fine here), you can further tune your system definition bypassing C2 (100u) on the shunt Vref. This cap is determinant in overall tone also.

Do Not bypass the shunt output cap because you will probably make it unstable.

Regards
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Old 22nd January 2011, 10:20 AM   #5775
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Quote:
Originally Posted by RCruz View Post
Hi Ulf

After you experiment with cart load and reduce the 15n cap (IMO micas are fine here), you can further tune your system definition bypassing C2 (100u) on the shunt Vref. This cap is determinant in overall tone also.

Do Not bypass the shunt output cap because you will probably make it unstable.

Regards
I suspect that Ulf doesn't use the Salas Shunt Low Voltage regulator, because he answered linking the Salas NJFET Phono RIAA schematic used by him.
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Old 22nd January 2011, 10:22 AM   #5776
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Ulf

If you don't have the Salas Shunt Low Voltage regulators you must try it because if you don't have the regs. you are loosing a lot of full potential of Salas NJFET RIAA

Cheers

Felipe
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Old 22nd January 2011, 10:25 AM   #5777
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by le´flu View Post
Hi,
dont know which shunt version. Please look at posting 4141,
there you can see the schematics.

Greetings Ulf
I believe this is the schematic: Simplistic NJFET RIAA
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Old 22nd January 2011, 10:29 AM   #5778
le´flu is offline le´flu  Germany
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Hi there,
yes RCruz, that´s the schematic that i use at the moment. Felipe could you link
me to the in your oppinion better shunt-reg version please?

Greetings Ulf
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Old 22nd January 2011, 10:34 AM   #5779
RCruz is offline RCruz  Switzerland
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The reg you are using is very good.... Just experiment bypassing 100u vref cap (C2) or use a BG there.... You will be amazed.

But first you should try Salas indications regarding lowering 15n on the riaa (a slight change here makes enormous difference) and than tune cart load.

Depending on your findings, you could upgrade to Salas V12r shunt that provides more detail. (In this case you will be using film caps on vref)

Last edited by RCruz; 22nd January 2011 at 10:37 AM.
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Old 22nd January 2011, 10:53 AM   #5780
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Quote:
Originally Posted by le´flu View Post
Hi there,
yes RCruz, that´s the schematic that i use at the moment. Felipe could you link
me to the in your oppinion better shunt-reg version please?

Greetings Ulf
The optimal reg. is the same posted by Salas togheter his Phono NJFET RIAA that you are using, did you do the regulator also?

If you don't do it, do like RCruz advice, do the reg. Salas V1.2R it's simply the best.

Cheers

Felipe

Last edited by merlin el mago; 22nd January 2011 at 10:56 AM.
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