Simplistic NJFET RIAA

audiotux · 2010-10-28 2:17 pm

63db-Version 10,5mA IDSS Post 2795
60db-Version 8,2mA IDSS max. Post 3138
60db-Version 11.0mA IDSS for DL103 R Post 3767
60db-Version 8,5-8,7mA IDSS Post 3069
56db-Version 8,0-9,0mA IDSS Post 1814
55db-Version 6,6mA IDSS for Lyra Dorian Post 4141
52db-Version for 0,5mV MCs Post 236
48db-Version 8,0-9,0mA IDSS Post 1813
46db-Version for Benz ACE Post 240
43db-Version 4,0mA IDSS Post 4600
41db-Version 8,0-9,0 mA IDSS Post 1812
38db-Version 4,0 mA IDSS Post 5118
36db-version 7,0-8,0 mA IDSS Post 417

Stargrounding : Post 3468 , 3476 + 3477
20db= 10x 30db= 31,6x 40db= 100x 50db= 316x 60db= 1000x

merlin el mago · 2010-10-28 2:39 pm

audiotux said:
63db-Version 10,5mA IDSS Post 2795
60db-Version 8,2mA IDSS max. Post 3138
60db-Version 11.0mA IDSS for DL103 R Post 3767
60db-Version 8,5-8,7mA IDSS Post 3069
56db-Version 8,0-9,0mA IDSS Post 1814
55db-Version 6,6mA IDSS for Lyra Dorian Post 4141
52db-Version for 0,5mV MCs Post 236
48db-Version 8,0-9,0mA IDSS Post 1813
46db-Version for Benz ACE Post 240
43db-Version 4,0mA IDSS Post 4600
41db-Version 8,0-9,0 mA IDSS Post 1812
38db-Version 4,0 mA IDSS Post 5118
36db-version 7,0-8,0 mA IDSS Post 417

Stargrounding : Post 3468 , 3476 + 3477
20db= 10x 30db= 31,6x 40db= 100x 50db= 316x 60db= 1000x

Thanks for your work, time to start a wiki with all information posted: schematics, layout, parts, psgr pdf, etc.?

ichiban · 2010-10-28 2:41 pm

audiotux Versions

Bravo!!! :up:

merlin el mago · 2010-10-28 3:08 pm

mV output cart

63db-Version 10,5mA IDSS Post 2795 output cart 0.25mV
60db-Version 8,2mA IDSS max. Post 3138 ouput cart 0.4mV
60db-Version 11.0mA IDSS for DL103 R Post 3767 ouput cart 0.25mV
60db-Version 8,5-8,7mA IDSS Post 3069 output cart 0.25mV
56db-Version 8,0-9,0mA IDSS Post 1814 output cart 0.25mV-0.5mV
55db-Version 6,6mA IDSS for Lyra Dorian Post 4141 output cart 0.6mV
52db-Version for 0,5mV MCs Post 236
48db-Version 8,0-9,0mA IDSS Post 1813 output cart 0.8-1mV
46db-Version for Benz ACE Post 240 output cart 0.8mV
43db-Version 4,0mA IDSS Post 4600 MM output cart 4mV
41db-Version 8,0-9,0 mA IDSS Post 1812 output cart 2-5mV
38db-Version 4,0 mA IDSS Post 5118 MM output 4mV
36db-version 7,0-8,0 mA IDSS Post 417 MM 3.5mV

audiotux · 2010-10-28 5:24 pm

thanx Merlin for your helpful adition !

Greetings from Germany
Jürgen

merlin el mago · 2010-10-28 5:39 pm

Thanks to you Jürgen

Cheers from Spain

Felipe

merlin el mago · 2010-10-28 6:05 pm

ichiban · 2010-10-28 7:10 pm

merlin el mago

OUTSTANDING!!!

merlin el mago · 2010-10-29 11:12 am

ichiban said:
merlin el mago

OUTSTANDING!!!

Thanks

Thomo · 2010-10-29 11:57 am

Excellent post Felipe, many thanks from me

I've just got myself a Dyanavector Karat MC which is old, but I'm pretty sure it's been re-tipped at some point, and I got it very cheaply. It sounds a lot better than my Ortofon MM, and now I need a new phono stage.

I plan to build this one http://www.diyaudio.com/forums/analogue-source/129126-simplistic-njfet-riaa-307.html#post2090662 as I still have the labeled and matched JFets.

I'll try to catch up with the thread during my spare time, but unfortunately I don't have much of that lately, so can anyone tell me the most recommended caps for the RIAA filter are please?

Thanks for the great thread Salas.

Lee.

Salas · 2010-10-29 12:09 pm

Economy class is MKP1837 Vishay 1%. 47nf & 15nF//330pF SMica. Then on its Mundorfs and Teflons. That Karat one is a low MC BTW?

Thomo · 2010-10-29 1:26 pm

Salas said:
Economy class is MKP1837 Vishay 1%. 47nf & 15nF//330pF SMica. Then on its Mundorfs and Teflons. That Karat one is a low MC BTW?

Those are the parts I thought would be good

I just had a look at the Karat manual and it has 0.2mV output, so it's very low isn't it?

Lee.

merlin el mago · 2010-10-29 2:03 pm

Thomo said:
Those are the parts I thought would be good

I just had a look at the Karat manual and it has 0.2mV output, so it's very low isn't it?

Lee.

Yes it's very low, you need 60-63dBs.

Thomo · 2010-10-29 2:30 pm

I've just tweaked the resistors on my original board to the values shown in the pdf file hosted earlier in the thread. I also have a shuntreg built on veroboard which has been untested for a couple of years, so hopefully I can have a listen later today.

Ricardo, are you still following this thread?

Lee.

Salas · 2010-10-29 2:48 pm

LMC Pre Pre

With LMC carts the best universal solution is a pre stage feeding a 47K MM phono input IMHO. You can integrate it on same PCB or not. It can even be a general pre pre unit. By that you get 20dB on top of a 40-45dB MM phono with better input equivalent noise. And you can have LMC & MM/HiMC inputs versatility. This one has a local capacitance multiplier filter and own reg so to try keep its noise down to the abilities of its signal Jfets. No different noise spec than 4X Jfet input LMC units with 10R source resistor per Jfet.

Salas · 2010-10-29 2:54 pm

Thomo said:
I've just tweaked the resistors on my original board to the values shown in the pdf file hosted earlier in the thread. I also have a shuntreg built on veroboard which has been untested for a couple of years, so hopefully I can have a listen later today.

Ricardo, are you still following this thread?

Lee.

That one is the recommended MM phono to feed from the above LMC stage for your 0.2mV Karat.

Thomo · 2010-10-29 2:57 pm

Wow, thank you Salas, I was thinking maybe that would be the best way to go.

Do you have experience with MC step-up transformers at all? I've read nothing but good things about the decent ones, but I don't think many people have tried a really good, low noise active stage and compared them.

I'd best go and get a stack of veroboard now then

Thanks,

Lee.

Salas · 2010-10-29 3:06 pm

I prefer active. Have made valve phonos with Lundahl Amorphous core and Dynavector silver wire SUTs. Yep, get some perfs, paint em black and if you manage to end up with a well grounded silent enough unit for music to emerge eerie from the dark, badge it Salas's Blacula.

Salas · 2010-10-29 3:16 pm

See what happens if someone messes with your TT if you have a Blacula phono.

Nobody unauthorized stops your vinyl replay without consequences.

Joshua_G · 2010-10-29 3:24 pm

Salas said:
With LMC carts the best universal solution is a pre stage feeding a 47K MM phono input IMHO. You can integrate it on same PCB or not. It can even be a general pre pre unit. By that you get 20dB on top of a 40-45dB MM phono with better input equivalent noise. And you can have LMC & MM/HiMC inputs versatility. This one has a local capacitance multiplier filter and own reg so to try keep its noise down to the abilities of its signal Jfets. No different noise spec than 4X Jfet input LMC units with 10R source resistor per Jfet.

1. Which version will have lower noise and better sound, your 60-63dB version, or your 36-46dB version + your pre-pre?
2. Wouldn't your pre-pre benefit from your Shunt Reg.?
3. Is there a benefit in adding capacitance multiplier after a Shunt Reg.?

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