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Old 24th May 2010, 01:13 PM   #3731
Salas is offline Salas  Greece
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Quote:
Originally Posted by kerux View Post
I was planning to build the Salas Riaa using the PSGR pdf for the MM Cartridge. I got some matched 2sk170's that are matched at 7.6 idss. Can I use them in the pdf schematic requiring 8-9ma? Or I see some of the older schematics require 7-8ma. Should I build one of these?

Any input is appreciated.
You will need to change R2 to 43R and R7 to 1.5K in the PSGR PDF'S MM, and you are good to go.
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Old 24th May 2010, 02:38 PM   #3732
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Originally Posted by Salas View Post
No. It will output 30dB gain before Riaa, and grossly overload your MM input.

Make this one I attach instead, you can check it out using just a 9V battery.
Has 10x gain with a 2SK170BL. The input resistor can be your MC cartridge manufacturer's recommended load value instead of the indicative 150R.
Wich Idss value for 2SK170BL?
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Old 24th May 2010, 03:21 PM   #3733
kerux is offline kerux  United States
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Originally Posted by Salas View Post
You will need to change R2 to 43R and R7 to 1.5K in the PSGR PDF'S MM, and you are good to go.
Thank you for the help. I will get these resistors.
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Old 24th May 2010, 04:02 PM   #3734
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
Wich Idss value for 2SK170BL?
I used 8.5mA which is common in BL. 7.5-9mA will do nicely for that basic pre pre.
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Old 25th May 2010, 01:50 PM   #3735
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Thank you Salas.
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Old 26th May 2010, 02:00 PM   #3736
smpkje is offline smpkje  Greece
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Quote:
Originally Posted by Salas View Post
Yes, you just use 33R for R1, 1k6 for R2, and 12V for V1 battery or whatever. That will give 26dB=x20 times.
hi Salas. Is the 8.09 and 8.12 good matched for 2sk170?
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Old 26th May 2010, 02:34 PM   #3737
Salas is offline Salas  Greece
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Old 26th May 2010, 04:30 PM   #3738
smpkje is offline smpkje  Greece
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Thank you Salas. I will try it in my opa604 diy MM phono stage
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Old 29th May 2010, 09:36 AM   #3739
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Hello

Some time ago, I built the "original" Le Pacifique circuit and I am very pleased with it.

I plan to build now the cascoded and output buffered version (thanks ikoflexer for the resuming document posted here Simplistic NJFET RIAA )

But I have only 2SK170 V's, mostly about 14mA IDSS.

Could I use it for this circuit?

What are the drawbacks / changes?

Maybe it is already described in this hughe thread?

Any pointer is appreciated.

Franz
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Old 29th May 2010, 11:19 AM   #3740
Salas is offline Salas  Greece
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Just let me know your cartridge and I will see values for proper bias with 14mA IDSS of the respective circuit. Half of it is the supply, you gotta make it too, been voiced together.
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