Simplistic NJFET RIAA - Page 914 - diyAudio
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Old 22nd January 2013, 12:31 PM   #9131
Salas is online now Salas  Greece
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Quote:
Originally Posted by buzzforb View Post
Also, how about an idea of testing the RIAA curve. I have pc Based scopes and partially functioning Tek 465
Use 1k to 10R LPAD, feed 100mV pink noise through it to your phono from your soundcard and loop it back to its line in while running any program like ARTA as spectrum analyzer on octave mode. A long EQ curve will appear that you can compare to textbooks.
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Old 22nd January 2013, 01:27 PM   #9132
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thanks.
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Old 22nd January 2013, 01:39 PM   #9133
RCruz is offline RCruz  Switzerland
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Originally Posted by buzzforb View Post
All is up and running now with much better numbers with added Rs on second stage. I have most of the parts for the second build and had a question as to PSU caps. RCruz, you stated that you were surprised to notice the effect of the PSU cap selection. Would you elaborate. My brothers version has Nichicon KG. I was considering the same or similar, with the addition of a large motor run before the SSLV. Any recommendations here?

Also, how about an idea of testing the RIAA curve. I have pc Based scopes and partially functioning Tek 465
Nichicon KG are good, you can start with that.

I found that everything matters but the simplistic sounds very good even with "normal" parts. My "wallis experiment" (1st folded build) uses only one TX and common psu for both channels and it sounds outstanding even with a Nuvotem 80VA tx and one Taiwan ELNA for audio 10000uf cap on the psu.

For my reference build I started with BG caps with toroids, went on through Nichicon, Mundorfs... and now settled with Jensen four poles powered by R-Core TX. (this combination in dual mono provides the best insight to the soundstage... IMO due to the better high freq operation of the Jensens)

Double mono is much better in terms of soundstage reproduction so I have it "full on".TX VA effect is quite audible also ... I am not sure the difference between R-Core and Toroids matter that much, but going from a single 80VA to a 160VA is impressive and now I have two 120VA one for each channel.... wider soundstage with much "easier" listening.

The simplistic is so good that you can benefit with every small detail.... output caps are also determinant.

It is all system dependent..... Cart load value and type can also make a BIG difference.

You must listen to it as is and then start finetunning if you need.

PS: please measure all components before you start the new build (fets, resistors and caps)... i am very interested in your opinion and I also have a "riaa calculator" to help tunning if needed.
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Last edited by RCruz; 22nd January 2013 at 01:54 PM.
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Old 22nd January 2013, 01:59 PM   #9134
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I can give you in circuit numbers for this build and will get pre-inserted numbers for the next.
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Old 22nd January 2013, 02:50 PM   #9135
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Ok... looking forward for that
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Old 24th January 2013, 11:33 AM   #9136
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Salas, or anyone. I am trying to add a selection section for the load resistor on my board and was having trouble finding the vertical pin connectors that allow you to bridge two with a square sleeve. Any ideas on a number from mouser. I don't know what they are called or how to find them.
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Old 24th January 2013, 11:48 AM   #9137
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Its cut off male pin header strip bits and mating jumpers like those on motherboards I used once in a build asking for that facility.
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Old 24th January 2013, 11:51 AM   #9138
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Like this (two row). 961214-6404-AR 3M Electronic Solutions Division | Mouser
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Old 24th January 2013, 12:08 PM   #9139
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Thank you sir.
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Old 24th January 2013, 12:47 PM   #9140
Salas is online now Salas  Greece
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Quote:
Originally Posted by etoiledusoir View Post
Yes it is night star. In the 19th century people were refering to the same star with two dirrefent names. Etoile du soir and etoile du matin (morining star).

I'm refering to the shematic in the wiki:
Salas Simplistic NJFET Riaa Schematics - diyAudio

Sorry for the ambiguity. Maybe i'll be more clear if I describe what I really want to do.
I'm using for now the shure m97 cartdrige and I have a bunch of 2sk170 matched at 6-6.5 ma that I want to use.
All Jfet drain pins are looking north towards B+. Good luck and let us know.
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