diyAudio

diyAudio (https://www.diyaudio.com/forums/index.php)
-   Analogue Source (https://www.diyaudio.com/forums/analogue-source/)
-   -   Simplistic NJFET RIAA (https://www.diyaudio.com/forums/analogue-source/129126-simplistic-njfet-riaa.html)

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

2 Attachment(s)
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....:scratch:

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! :smash:

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

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! :smash:

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

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 :xeye:

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 :smash:

Ricardo


All times are GMT. The time now is 12:52 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio

Wiki