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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 31st December 2010, 03:18 PM   #5721
nicoch58 is offline nicoch58  Europe
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Old 31st December 2010, 03:18 PM   #5722
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
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Happy New Year to everyone.
Same to you, and to everybody!
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Old 31st December 2010, 03:46 PM   #5723
merlin el mago is offline merlin el mago
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Feliz Año Nuevo para todos.
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Old 31st December 2010, 10:24 PM   #5724
audiotux is offline audiotux  Germany
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Happy New Year to all ,
Have a nice+prosper 2011 !

Grettings from Germany
Jürgen
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Old 1st January 2011, 12:16 PM   #5725
RCruz is offline RCruz  Switzerland
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Feliz Ano Novo para todos.

Desejos de muitas felicidades com sucesso, estabilidade, prosperidade, saúde e amor.
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Old 1st January 2011, 02:56 PM   #5726
RCruz is offline RCruz  Switzerland
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Originally Posted by RCruz View Post
I am loading the secondary with 47k.

I left room for loading the primary if I need to go lower than the resulting 470ohm (1:10)
After some hours critical listening, I consider this setup quite acceptable.

As I reported before, my intention is to prepare the 48dB riaa so it can be used with a 0.15mV output cart.

I implemented the SUT with 1:10 configuration and Rload on the secondary side (Riaa side) is 47kr that translates to 470 r real cart load on the primary side.

I do not have the special cart to test so I am listening with a 0.8mV output cart.

Tone is quite good. Overall sound is much better than the one resulting by using a cap to bypass Rsource on first stage.

As per my calculations, Voltage at SUT output is 7.6mV for this 0.8mV cart.
As I do not detect any clipping, I believe the 48dB Riaa can successfully be used even with very high output MM carts.

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Old 3rd January 2011, 11:15 PM   #5727
RCruz is offline RCruz  Switzerland
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I did some more fine tuning in the ccs area and find this to be a very critical and influential part of the schematic.....

Sound is now quite hypnotic
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Old 4th January 2011, 12:02 AM   #5728
SGregory is offline SGregory  United States
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So what did you fine tune? What current are you running?
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Old 4th January 2011, 11:48 PM   #5729
RCruz is offline RCruz  Switzerland
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Hi Sgregory

I am talking about the ccs over the cascode on the riaa first stage.

In this case current is fixed .... jfet Idss.

My tuning is only about modifying the cap esr and capacitance value.

I am using this thread´s "power" to determine the best possible voicing for this filter.
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Old 7th January 2011, 06:00 PM   #5730
SGregory is offline SGregory  United States
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Salas,
It has been more than a few days, but I finally remembered that I had the cartridge in my briefacse to weigh.

Stock Mounting hardware = 0.6741g
Denon 103R = 8.7520g

measured on a NIST traceable Mettler Lab Scale.
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