Simplistic NJFET RIAA - Page 370

merlin el mago · 7th May 2010, 11:51 AM

Quote:

Originally Posted by RCruz

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

RCruz · 7th May 2010, 07:01 PM

You might be surprised with the Nordost

merlin el mago · 8th May 2010, 03:06 PM

I tried Nordost & I don't surprised

cjcc67 · 22nd May 2010, 11:40 AM

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

Salas · 22nd May 2010, 01:50 PM

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.

merlin el mago · 22nd May 2010, 02:17 PM

Congratulations Salas for the new Simplistic Pre Pre Phono without RIAA gain x10

Salas · 22nd May 2010, 02:56 PM

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.

massimo · 22nd May 2010, 02:57 PM

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

Salas · 22nd May 2010, 03:12 PM

The gate stoppers add noise directly, and are not needed in practice IMO. Must be 2SK170BL too? Because I see same bias scheme.

massimo · 22nd May 2010, 03:26 PM

Yes, k170 or any similar NJfet such as K147 or K370 (the older and the newer)

22nd May 2010, 02:17 PM	#3696
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	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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7th May 2010, 07:01 PM	#3692
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	You might be surprised with the Nordost

8th May 2010, 03:06 PM	#3693
merlin el mago diyAudio Member Join Date: Sep 2009 Location: Catalonia new Europe state	I tried Nordost & I don't surprised

22nd May 2010, 11:40 AM	#3694
cjcc67 diyAudio Member Join Date: Aug 2009 Location: Melbourne	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

22nd May 2010, 02:56 PM	#3697
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

22nd May 2010, 03:12 PM	#3699
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The gate stoppers add noise directly, and are not needed in practice IMO. Must be 2SK170BL too? Because I see same bias scheme.

22nd May 2010, 03:26 PM	#3700
massimo diyAudio Member Join Date: Dec 2002 Location: Milan, Italy	Yes, k170 or any similar NJfet such as K147 or K370 (the older and the newer)