Simplistic NJFET RIAA - Page 101

metalman · 10th February 2009, 03:29 PM

I also want to extend to Salas my thanks for sharing this project. I've been lurking on this thread for quite a while now, and am definitely planning on implementing this phono stage.

Great work!

Terry

RCruz · 10th February 2009, 09:22 PM

Soon I will join the "experienced" ones

All resistors in place (had to deviate a little from Lee´s layout to acomodate the uge 1M kiwame).

Promising.....

Just a little question.. I know my version has a buffered output and my intention is to do the following path:

Riaa -> 50k dual log pot -> Pedja Buffer -> Meridian 103 power amp.

Is this a good idea ? I just want to avoid the 101b opamp output stage but I am a bit confused....

Regards

Ricardo

Salas · 10th February 2009, 09:52 PM

The Pedja has a better chance of sounding more transparent than the 101b I guess. But you just have to compare. Maybe you will need 101's gain. I would set up phono-101-103 first. After all has burned in, and familiar with, I would listen VS phono-pot-Pedja-103.

iko · 10th February 2009, 11:23 PM

Go Ricardo, Go!

Got the k40y-9 PIO russian caps today, in the .15u value. They're burning in

Salas · 11th February 2009, 01:08 AM

Quote:

Originally posted by metalman
I also want to extend to Salas my thanks for sharing this project. I've been lurking on this thread for quite a while now, and am definitely planning on implementing this phono stage.

Great work!

Terry

Thank you for your kind words. Good luck with your planned build. We will be happy to know your experiences and tunings when ready. What is your TT, arm, cart and rest of system right now? Already having a phono? DIY?

RCruz · 11th February 2009, 09:33 AM

Quote:

Originally posted by salas
The Pedja has a better chance of sounding more transparent than the 101b I guess. But you just have to compare. Maybe you will need 101's gain. I would set up phono-101-103 first. After all has burned in, and familiar with, I would listen VS phono-pot-Pedja-103.

I will do just what you sugested Salas.

Firstly I will feed the Salas Riaa through the 101, maintaining the 101 gain.

After that I will build a dedicated pre based on the pedja.

Nevertheless I am glad to know you did not find any issues in using riaa + pot + buffer.

Ricardo

RCruz · 11th February 2009, 07:45 PM

Quote:

Originally posted by ikoflexer
Go Ricardo, Go!

Got the k40y-9 PIO russian caps today, in the .15u value. They're burning in

Hi ikoflexer

What value are you using for C1 ?

I have a russian k40-9 0.047 there but looking at the photos previously posted, these seems so small

Ricardo

Salas · 11th February 2009, 07:49 PM

C1 you mean the one that couples to the second stage?

Salas · 11th February 2009, 07:53 PM

If you mean that one after the RIAA that goes to the 1meg to earth and second JFET's gate, then 47nF to 150nF will do. Center is 100nF. The response will still go subsonic with all of the above. No problem.

RCruz · 11th February 2009, 10:20 PM

Almost done..... left the jfets and big output cap for tomorrow

Ricardo

11th February 2009, 10:20 PM	#1010
RCruz diyAudio Member Join Date: Sep 2006 Location: Saxon Blog Entries: 1	Almost done..... left the jfets and big output cap for tomorrow Ricardo __________________ RC

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

10th February 2009, 03:29 PM	#1001
metalman diyAudio Member Join Date: Jun 2003 Location: Calgary, Alberta	I also want to extend to Salas my thanks for sharing this project. I've been lurking on this thread for quite a while now, and am definitely planning on implementing this phono stage. Great work! Terry

10th February 2009, 09:52 PM	#1003
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	The Pedja has a better chance of sounding more transparent than the 101b I guess. But you just have to compare. Maybe you will need 101's gain. I would set up phono-101-103 first. After all has burned in, and familiar with, I would listen VS phono-pot-Pedja-103.

10th February 2009, 11:23 PM	#1004
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	Go Ricardo, Go! Got the k40y-9 PIO russian caps today, in the .15u value. They're burning in

11th February 2009, 07:49 PM	#1008
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	C1 you mean the one that couples to the second stage?

11th February 2009, 07:53 PM	#1009
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	If you mean that one after the RIAA that goes to the 1meg to earth and second JFET's gate, then 47nF to 150nF will do. Center is 100nF. The response will still go subsonic with all of the above. No problem.