Simplistic NJFET RIAA - Page 717 - 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 30th January 2012, 04:48 PM   #7161
diyAudio Member
 
Join Date: Jan 2006
Location: North west England
Found it!

Superb

Pics will follow when it's done

Thank you so much

Chalk
  Reply With Quote
Old 30th January 2012, 04:51 PM   #7162
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Let us know your progress, cheers.
  Reply With Quote
Old 30th January 2012, 05:24 PM   #7163
diyAudio Member
 
vdi_nenna's Avatar
 
Join Date: Oct 2000
Location: PA, USA
Blog Entries: 1
Send a message via Yahoo to vdi_nenna
Salas,

That is a good evolution for me, because I can build the pre-pre first and test it against my current phono pre, then move on to the MC pre.

Thanks,

Vince
__________________
I build, therefore I am.

Last edited by vdi_nenna; 30th January 2012 at 05:35 PM.
  Reply With Quote
Old 30th January 2012, 06:34 PM   #7164
diyAudio Member
 
Join Date: Mar 2006
Location: Sheffield, England
Quote:
Originally Posted by merlin el mago View Post
Polysterenes are also very good, RIAA caps important thing is tolerance & accuracy as stated by RCruz. If yours styrenes are 1% surely sounds better than teflons 5% or more tolerance.
I'll be measuring and matching them as my meter can measure capacitance. I intend to match the 5% Teflons up using low-value polystyrenes. Hopefully the Teflons will be here in the next couple of days so I can get on with the build.
  Reply With Quote
Old 31st January 2012, 09:45 PM   #7165
diyAudio Member
 
Join Date: Jan 2006
Location: North west England
I have just read the pdf on the HiMM (great info by the way) and need to check with you about matching the fets.

In the range 8 to 8.5mA:

I have 4 at 8.4mA. So these could be Q1 and Q2 (two for each channel).

I also have 2 at 8.3mA. So these could be Q3.

Finally I have 2 at 8.2mA. These could be Q5.

Have I understood correctly?
  Reply With Quote
Old 31st January 2012, 10:04 PM   #7166
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Yes.
  Reply With Quote
Old 31st January 2012, 10:08 PM   #7167
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by vdi_nenna View Post
Salas,

That is a good evolution for me, because I can build the pre-pre first and test it against my current phono pre, then move on to the MC pre.

Thanks,

Vince
Not a bad plan. Although the complete Simplistic is the business in the end of the day, you can go step by step at your leisure. There is a pre-pre thread also where you can get ideas, as some members had built it on its own too.
2SK170 BL MC step up amp
  Reply With Quote
Old 31st January 2012, 10:09 PM   #7168
diyAudio Member
 
Join Date: Jan 2006
Location: North west England
Great Thanks
  Reply With Quote
Old 1st February 2012, 03:38 AM   #7169
diyAudio Member
 
kstlfido's Avatar
 
Join Date: Mar 2006
Location: Berkeley, CA
Default Listening fun! And... any more gain?

Just a note to say thanks again Salas. I've been listening, listening and listening. Got me hunting for vinyl now! Must have picked up 50 LP's in the past 2 months. I can really hear the dynamics of some recordings now. Just listening to Earth Wind and Fire- Praise. It really came alive! Donald Fagen's recordings are also quite lively. Others sound a bit dead by comparison.

One day, I'll get the Salas RIAA in a box!

One question- Is there any way to get a few more db out of the circuit, apart from adding source bypass caps? I built the MC RIAA 8-8.5 idss from your Document version 11.02.F0.

I do have some more matched jfets in the 8.5-10mA idss range. Though I gather the RIAA values would need to recalculated.

If hard to do, I'll leave as-is. I just like running straight w/o a line amp, but could go that route if needed.

Anyway, big thanks again from Berkeley, CA! You got me back into vinyl!

-Kent
  Reply With Quote
Old 1st February 2012, 03:47 AM   #7170
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Cheers Kent. With the parts quality you used and fine p2p workmanship its a pity to mod it. Use Sowter 9395 autoformer attenuator and utilize its +6 dB gain tap. Two birds with one stone. Best than any resistive pot and your gain there. Has a +12dB gain tap even.
  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 12:49 PM.


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