Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Simplistic NJFET RIAA
Simplistic NJFET RIAA
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 28th September 2008, 09:21 PM   #131
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Simplistic NJFET RIAA
Quote:
Originally posted by salas
First diy 1981, B110+T27...
Wasn't the Daline was it? (HiFi News and Record Review, sometime 1975). This was my 2nd DIY Speaker set.
  Reply With Quote
Old 28th September 2008, 11:10 PM   #132
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
No, it was from Sound & Hi-Fi Greek magazine. About 10lt closed, Acoustic Butterworth crossover with no baffle step. Was to be combined with a B139 sub. But I made a bigger one, BR with a double coil Audax 30cm (12inch), sensitive enough unit and a central passive crossover at 170Hz.

*Nicoch46, I am tuning a special 40dB version for the DL-160. Will show soon.
  Reply With Quote
Old 29th September 2008, 06:44 PM   #133
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Default High MC out version

This is the version that the gain, loading and sound is the best I could find for high output MC. I used the Denon DL-160 as a standard. Sounds really neutral as a combination. In case someone needs some more gain, the Rsource 50R can go down to 33R. I was more than OK with 40dB and the Denon, that looks like producing more than its nominal 1.6mV to me, rather something like 2mV+. But I have sensitive speakers too. The 120nF coupler can be 100nF. The Cout is arbitrary value. See the Salas MC comments on the page before for that.

So we have 3 options: The MC Salas RIAA for 0.5mV, the same can be modified with a 1st stage Rsource bypassing capacitor as shown on its schematic (previous thread page) for +6dB and 0.2mV carts, and this last one with low PSU, and a couple of resistor value changes for high output MCs, 1.5mV-2mV or 1mV with 33R Rs. All 3 options are well tuned, checked, and thoroughly auditioned. Using a variable regulator for B+ someone can easily modify the MC version for high MC in 10 mins with a soldering iron.

That's about it.
Attached Images
File Type: jpg salashighmcphono.jpg (21.9 KB, 2043 views)
  Reply With Quote
Old 29th September 2008, 06:48 PM   #134
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Here is how the Denon DL-160 measures through the high MC version on Telarc Omnidisc pink noise L+R track.
Attached Images
File Type: gif denonl.gif (13.3 KB, 1809 views)
  Reply With Quote
Old 29th September 2008, 07:12 PM   #135
nicoch58 is offline nicoch58  Europe
diyAudio Member
 
Join Date: Oct 2004
Wow!!

You use 20 v for jfet sweet spot ?

no problem for me, variable psu 18-26 v

yes 2,2mv!
  Reply With Quote
Old 29th September 2008, 07:16 PM   #136
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Yes sweet spot hit, for best stability, no leakage and best THD.
You still have your DL-160? 1k loading worked best in this combination too.
  Reply With Quote
Old 29th September 2008, 07:25 PM   #137
nicoch58 is offline nicoch58  Europe
diyAudio Member
 
Join Date: Oct 2004
dl-160 are on rega ,1k not close the sound stage?


with mad_k I have 23,5k ,with 3k close in ,great difference ....
  Reply With Quote
Old 29th September 2008, 07:31 PM   #138
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
In my case it worked more open and correct @ 1k. It tends to spray HF distortion and more noise with high RL. My guess is that in non neutral systems with a bit of bass boom & beaming HF, high RL compensates and sounds ''open''. But I will listen again with 15k after more break in, maybe my impression is going to change.
  Reply With Quote
Old 29th September 2008, 07:37 PM   #139
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Simplistic NJFET RIAA
Quote:
Originally posted by nicoch46
with mad_k I have 23,5k ,with 3k close in ,great difference ....
...Also mad_k has a different distortion profile. More 2nd Harmonic. It also will produce much output with the Denon, and I don't know if it starts saturating with 2nd H above normal, tending to sound thicker.
  Reply With Quote
Old 29th September 2008, 07:55 PM   #140
nicoch58 is offline nicoch58  Europe
diyAudio Member
 
Join Date: Oct 2004
Quote:
Originally posted by salas
My guess is that in non neutral systems with a bit of bass boom & beaming HF
my supravox don't do thorsten L. project....
  Reply With Quote

Reply


Simplistic NJFET RIAAHide 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

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 03:25 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki