Simplistic NJFET RIAA - Page 927 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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
Reply
 
Thread Tools Search this Thread
Old 9th February 2013, 11:26 AM   #9261
massimo is offline massimo  Italy
diyAudio Member
 
Join Date: Dec 2002
Location: Milan, Italy
Quote:
Originally Posted by Salas View Post
Only Zen Mod can comment successfully further on from that point.
No connection with "the One and Only" though I was just referring to the Jedi knights
  Reply With Quote
Old 9th February 2013, 11:47 AM   #9262
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by merlin el mago View Post
Do you refer to change R2-3 3 ohms to 3R3 ohms?

Wich position 11,63: first stage?
There are two Rs one under each BL. You need run about 9mA through each to have exactly the same variables as with the original schematic for 11mA. When having a bit more IDSS you can experimentally compensate by rising the Rs a little.
  Reply With Quote
Old 9th February 2013, 11:49 AM   #9263
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Sorry my ignorance how can measure the 9mA?

Could I use 50R trimmer for R8 to trimm 43R?
  Reply With Quote
Old 9th February 2013, 12:09 PM   #9264
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
We are talking the two small Rs in your first stage. You can measure mV voltage drop on them and divide by their value and try next value up or next after that. Better not use trimmer on second stage because the 43R value in normal resistor provides enough degeneration to match the gain of many non same IDSS and it has better ppm and long term reliability by having no moving contact.
  Reply With Quote
Old 9th February 2013, 12:53 PM   #9265
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Thanks.
  Reply With Quote
Old 9th February 2013, 02:34 PM   #9266
diyAudio Member
 
nicoch58's Avatar
 
Join Date: Oct 2004
Quote:
Originally Posted by Salas View Post
Only Zen Mod can comment successfully further on from that point.
__________________
Sic58
  Reply With Quote
Old 11th February 2013, 02:01 PM   #9267
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
My brother and I spent a good deal of time listening this week. The board were put in a proper case. The psu is standalone with dual 175Va EI. They feed Mur860 diodes and Siemens Sikorels(3.3mF). Neutrick umbilical to main case. Whole thing is dead quiet, and with volume turned all the way up, all you hear is slighte valve noise from tube. Put 1uF SIO on the output. It was wonderful. You knowit is good, becaue you could hear the change in caps fromObbligato oilers to SIO. Classic SIO smooth and accentuated mids and highs. Background is so black, my brother starting laughing, as on one track of Morph The Cat, he heard some suttle guitar picking that he had not even heard before. It is truly a wonderful phono and has me looking to build a quality vinyl rig. Ill need some suggestions there, BTW. I am sending one to Salas to see if h thinks the SMD make a differnence. I believe they do, ubt you know how that goes I lave you with an email from my brother, who is acting like a child, I might add.

Well done Salas. This phono is truly HiFi.

My brother comments.

"..the Patricia Barber is completely indescribable...the standup bass
has a snap to it. I have heard 100k systems that don't sound this
good...this smokes the X Ono and the Linto. You have a winner..."
__________________
...Shape the sound , Man!
  Reply With Quote
Old 11th February 2013, 02:08 PM   #9268
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
I think making the brother happy was worth it alone.

I am a VPI table fan myself. The VPI Traveler is there new intro-table. Made is USA.
  Reply With Quote
Old 11th February 2013, 02:13 PM   #9269
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
We have Audio Advice in Raliegh Nc. While they are now mostly doing big money home theatre stuff, they used to be big time hifi, carrying Linn, Musical Fidelity and other high end equipment. My brother and family friend were regulars and both have heard quite a bit of equipment. A great deal more than I. Both are very impressed with the RIAA. I have the Paradise kit and absolutley no desire to build it. You have to appreciate the nakedness of the sound when cap change is so obvious. It is my hope that the .1% 25ppm resistors also do their job of getting out of the way. Salas, will let us know there.

Ill check out VPI, but not against DIY
__________________
...Shape the sound , Man!
  Reply With Quote
Old 11th February 2013, 05:41 PM   #9270
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Salas Mouser gives as alternative of SK170BL the 2N5486, could it use in place of SK170BL?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 08:33 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2