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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 7th May 2010, 11:51 AM   #3691
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by RCruz View Post
Hi Pete

I guess this connectors will make difference if you are already using duelund caps in the output and also 1k interconnects.
I believe more in the cap than in the interconnects
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Old 7th May 2010, 07:01 PM   #3692
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
You might be surprised with the Nordost
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Old 8th May 2010, 03:06 PM   #3693
merlin el mago is offline merlin el mago
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I tried Nordost & I don't surprised
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Old 22nd May 2010, 11:40 AM   #3694
cjcc67 is offline cjcc67  Australia
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Hi Salas great work here.
I have zero experience with design. If i wanted to just use the Low MC as a head IE no RIAA, is this possible to use in series with my existing mm phono stage. The cartridge output is 0.4 mV
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Old 22nd May 2010, 01:50 PM   #3695
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
No. It will output 30dB gain before Riaa, and grossly overload your MM input.

Make this one I attach instead, you can check it out using just a 9V battery.
Has 10x gain with a 2SK170BL. The input resistor can be your MC cartridge manufacturer's recommended load value instead of the indicative 150R.
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Old 22nd May 2010, 02:17 PM   #3696
merlin el mago is offline merlin el mago
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Thumbs up New simplistic pre pre phono without riaa x10gain

Congratulations Salas for the new Simplistic Pre Pre Phono without RIAA gain x10
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Old 22nd May 2010, 02:56 PM   #3697
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Just a basic proper gain stage so someone can use his MC cart on his MM phono in its most simple. There are sophisticated circuits with better noise. This one is handy to make fast and will do the job rather decently, thats all.
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Old 22nd May 2010, 02:57 PM   #3698
massimo is offline massimo  Italy
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Default Jfet MC Head amp

A similar project, complete with "series" PS, published years ago on these pages by English member Kwei Yang Wang.

See also thread The Analogue Addicts Phono Preamplifier 2006 Edition
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Old 22nd May 2010, 03:12 PM   #3699
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
The gate stoppers add noise directly, and are not needed in practice IMO. Must be 2SK170BL too? Because I see same bias scheme.
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Old 22nd May 2010, 03:26 PM   #3700
massimo is offline massimo  Italy
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Yes, k170 or any similar NJfet such as K147 or K370 (the older and the newer)
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