Ultrasimple mm/mc RIAA preamp 2 - Page 9

jackinnj · 29th July 2008, 09:16 PM

Maison using N-1 topology:

nicoch58 · 30th July 2008, 10:30 AM

HI jackinnj

thanks for your fast and good work!

nicoch58 · 31st July 2008, 01:01 PM

well I rebuilt the phono with mad k riaa (not perfect riaa value ), in my sistem sound more balanced ,I change the r load to 47k for open up a little more .

BUT but in this jfet phono the kind of component r/c are vey important , more of little riaa deviance !!!!!

I have change the good vishay mkp1847 with a mundorf s/o ,
with mkp the Cymbal are in the face with s/o too hidden/soft!

OK little difference are normal but so big

PS
I will try the jackinnj riaa

jackinnj · 31st July 2008, 01:32 PM

Quote:

Originally posted by nicoch46

I will try the jackinnj riaa

It's found in Walt Jung's "Op Amp Applications Handbook" -- you can get individual chapters of the book on ADI's website. I just scaled the values.

johnm · 23rd September 2008, 12:34 AM

Hi folks.

Have some SK170GR's arriving this week, so I can get started on this project at last

I have a Denon MC 103R but I don't think the gain in this circuit is enough to do it justice - anyone tried an MC with this pre? I might have to use my MM Goldring G1042 instead.

Just a little confused which schematic to use: Mad Ks, the original Pacific, or the Pacific with Tschrama's fine tuned RIAA? Which design - on paper at least - offers the closest adherence to the RIAA specification?

Many thanks,

- John

nicoch58 · 23rd September 2008, 08:15 AM

the mad_k are the better (idss-4-6ma)but with 103 you need more gain ,the Salas jfet are the best link

sorry 2sk170bl idss 7-7,5ma

use good component !

audiodesign · 23rd September 2008, 09:01 AM

I suggest my design

http://www.audiodesignguide.com/Phono/pre-phono2.html

nicoch58 · 23rd September 2008, 09:04 AM

Sure !

but I can't see jfet

johnm · 23rd September 2008, 10:10 AM

Cheers for the replies

Audiodesign - nice design, but a wee bit complicated (and expensive) for me at present. Will start with this Ultrasimple, then probably move to the Phonoclone next and then... well I'll take it a step at a time - lol!

Nicoch46 - Sorry do you mean I need to use the BL jfets? I thought it was the GR versions required for this design?

Thanks,

- John

nicoch58 · 23rd September 2008, 10:19 AM

Johnm with 103 you must use Salsas jfet ! for correct gain

the goldring have too much output 6,5mv saturate the jfet !

aka pacific work well with 1,6-3,5 mv HIMO

PS BL in pacific with 33r on surce lowered the 2HD a lot ,but I like it!

30th July 2008, 10:30 AM	#82
nicoch58 diyAudio Member Join Date: Oct 2004	HI jackinnj thanks for your fast and good work! __________________ Sic58

31st July 2008, 01:01 PM	#83
nicoch58 diyAudio Member Join Date: Oct 2004	well I rebuilt the phono with mad k riaa (not perfect riaa value ), in my sistem sound more balanced ,I change the r load to 47k for open up a little more . BUT but in this jfet phono the kind of component r/c are vey important , more of little riaa deviance !!!!! I have change the good vishay mkp1847 with a mundorf s/o , with mkp the Cymbal are in the face with s/o too hidden/soft! OK little difference are normal but so big PS I will try the jackinnj riaa __________________ Sic58

23rd September 2008, 08:15 AM	#86
nicoch58 diyAudio Member Join Date: Oct 2004	the mad_k are the better (idss-4-6ma)but with 103 you need more gain ,the Salas jfet are the best link sorry 2sk170bl idss 7-7,5ma use good component ! __________________ Sic58

23rd September 2008, 09:04 AM	#88
nicoch58 diyAudio Member Join Date: Oct 2004	Sure ! but I can't see jfet __________________ Sic58

23rd September 2008, 10:19 AM	#90
nicoch58 diyAudio Member Join Date: Oct 2004	Johnm with 103 you must use Salsas jfet ! for correct gain the goldring have too much output 6,5mv saturate the jfet ! aka pacific work well with 1,6-3,5 mv HIMO PS BL in pacific with 33r on surce lowered the 2HD a lot ,but I like it! __________________ Sic58


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29th July 2008, 09:16 PM	#81
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Maison using N-1 topology:

23rd September 2008, 12:34 AM	#85
johnm diyAudio Member Join Date: Sep 2003 Location: Hampshire	Hi folks. Have some SK170GR's arriving this week, so I can get started on this project at last I have a Denon MC 103R but I don't think the gain in this circuit is enough to do it justice - anyone tried an MC with this pre? I might have to use my MM Goldring G1042 instead. Just a little confused which schematic to use: Mad Ks, the original Pacific, or the Pacific with Tschrama's fine tuned RIAA? Which design - on paper at least - offers the closest adherence to the RIAA specification? Many thanks, - John

23rd September 2008, 09:01 AM	#87
audiodesign diyAudio Member Join Date: Sep 2005	I suggest my design http://www.audiodesignguide.com/Phono/pre-phono2.html

23rd September 2008, 10:10 AM	#89
johnm diyAudio Member Join Date: Sep 2003 Location: Hampshire	Cheers for the replies Audiodesign - nice design, but a wee bit complicated (and expensive) for me at present. Will start with this Ultrasimple, then probably move to the Phonoclone next and then... well I'll take it a step at a time - lol! Nicoch46 - Sorry do you mean I need to use the BL jfets? I thought it was the GR versions required for this design? Thanks, - John

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