Simplistic NJFET RIAA - Page 373 - diyAudio
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Old 24th May 2010, 06:02 AM   #3721
kerux is offline kerux  United States
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Newbie question about Power transformer? I have been reading the pdf file that PSGR produced about the transformer required for a MM Cartridge. I have a shure m 97x, so I need the 24V 50VA transformer. Can I use the Hammond 166L24 which is a 24v 48VA transformer? It is cheaper from digikey than a 24v 50va toroidal transformer. Any input is appreciated. Thanks
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.
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Old 24th May 2010, 10:19 AM   #3722
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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.
How many Idss for NJFETs?
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Old 24th May 2010, 10:53 AM   #3723
cjcc67 is offline cjcc67  Australia
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Yes. What is your now MM phono stage you want the MC pre pre for?
Salas attached my current phono stage. It is best opened using windows picture viewer so you can zoom
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File Type: jpg phono.jpg (496.1 KB, 238 views)
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Old 24th May 2010, 11:01 AM   #3724
vgeorge is offline vgeorge  Greece
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Used to have this preamp years ago.
Try to built Salas one ASAP! Not only an MC satge.
There is no comparison.

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Salas attached my current phono stage. It is best opened using windows picture viewer so you can zoom
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Old 24th May 2010, 11:08 AM   #3725
cjcc67 is offline cjcc67  Australia
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I built this in 1990. Iam getting some extra fets for a Salas RIAA. I also like to try the Allen wright design all tube
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Old 24th May 2010, 11:09 AM   #3726
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.
Will simulate your Idss in that MM circuit and let you know.
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Old 24th May 2010, 11:11 AM   #3727
Salas is offline Salas  Greece
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Originally Posted by cjcc67 View Post
I built this in 1990. Iam getting some extra fets for a Salas RIAA. I also like to try the Allen wright design all tube
Tubes we have checked out many through the years. Including Allen's and Steve Bench's. For those I developed the SSHV originally.

P.S. I did one too Valve Itch phono
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Old 24th May 2010, 11:34 AM   #3728
cjcc67 is offline cjcc67  Australia
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which is your favourite?
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Old 24th May 2010, 11:42 AM   #3729
Salas is offline Salas  Greece
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The Itch and the Bench. The Itch was made by listening to the Bench and the Simplistic. The Bench managed after I measured its Riaa transfer function and changed a key value. Without the SSHV PSU was less than the Itch. Kofi Annan made it with SSHV and the Riaa mod. Had a thread here. I have given the Itch to a friend who had the Thorsten grid leak and did not get to apply an SSHV to it so to know how it goes with it. He does not give it back for experiment, he listens to vinyl every day! But I will grab it one time!
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Old 24th May 2010, 12:12 PM   #3730
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How many Idss for NJFETs?
@Salas
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