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Old 8th January 2014, 07:25 PM   #1
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Default RIAA Pacific rookie attempt

Hi everyone,

My RIAA literally went to smoke, so my 1210 is just staring in the wall doing nothing, i thought this was the best excuse to make an attempt on building the RIAA Pacific.

I have made a very quick drawing in EAGLE based on the Boozehound JFET Phono Preamp, which i would like to receive some comments on, please be aware that this is my first serious audio circuit. :-)

Caps:
C2, C7, C3 = MKP1837
C6 = RIFA PHE427
C4 = WIMA FKP2
C10, C9 = Nichicon Muse KZ

Schematic:
Click the image to open in full size.

Board:
Click the image to open in full size.

Last edited by RobFreak; 9th January 2014 at 08:27 PM. Reason: New revision
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Old 8th January 2014, 07:54 PM   #2
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Boozhound Laboratories: JFET Phono Preamp Kit

This is a bit modified version and works very well. I have assembled it on a veroboard and it sounds great.
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Old 8th January 2014, 07:56 PM   #3
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Quote:
Originally Posted by dine1967 View Post
Boozhound Laboratories: JFET Phono Preamp Kit

This is a bit modified version and works very well. I have assembled it on a veroboard and it sounds great.
I was very close to buying that kit, but i wanted to do my own attempt. Only thing that bothers me are the Russian caps that are slightly expensive. Could MCap not be a replacement? I made an update to my schematic. :-)

Last edited by RobFreak; 8th January 2014 at 08:22 PM.
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Old 9th January 2014, 07:48 AM   #4
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Quote:
Originally Posted by dine1967 View Post
Boozhound Laboratories: JFET Phono Preamp Kit

This is a bit modified version and works very well. I have assembled it on a veroboard and it sounds great.
I made a clone, although without the Russian caps.
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Old 9th January 2014, 02:34 PM   #5
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Caps are a touchy subject here and everyone has their opinions. If you think you can hear difference then use whatever you feel are the best. I have used 2% and 5% WIMA caps and its good enough for me.
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Old 9th January 2014, 02:39 PM   #6
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Quote:
Originally Posted by dine1967 View Post
Caps are a touchy subject here and everyone has their opinions. If you think you can hear difference then use whatever you feel are the best. I have used 2% and 5% WIMA caps and its good enough for me.
Touchy and religious. I have updated my post with the caps.
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Old 9th January 2014, 05:43 PM   #7
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And a update schematic/board.
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Old 9th January 2014, 06:41 PM   #8
Hikari1 is offline Hikari1  United States
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I have the Boozehound kit, and built it first w/the Russian PIO caps.

I now have a sliver mica at c4, Jantzen silver at the output, REL polystyrene at C7, Vishay 1837 at c2 and a wima at c3. The sound is much more open and aggressive. To me, the Russian PIO caps are rolled off and soft but some may find that appealing.

If I was upgrading/replacing just one cap it would be the output cap and/or the interstage coupling cap.

Also, I am running 16 AA batteries which works well but I'd like to investigate regulated power supplies in the future...batteries are kind of a pain.
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Old 9th January 2014, 06:47 PM   #9
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Quote:
Originally Posted by Hikari1 View Post
I have the Boozehound kit, and built it first w/the Russian PIO caps.

I now have a sliver mica at c4, Jantzen silver at the output, REL polystyrene at C7, Vishay 1837 at c2 and a wima at c3. The sound is much more open and aggressive. To me, the Russian PIO caps are rolled off and soft but some may find that appealing.

If I was upgrading/replacing just one cap it would be the output cap and/or the interstage coupling cap.

Also, I am running 16 AA batteries which works well but I'd like to investigate regulated power supplies in the future...batteries are kind of a pain.
Have you tried any other than the Jantzen silver on the output? I see they go for 15€ from Germany and a bit higher in Denmark, even though they are made here.. Id love to hear more about that, are you thinking in terms of noise filtering a AC-DC converter output?

Last edited by RobFreak; 9th January 2014 at 06:50 PM.
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Old 9th January 2014, 06:54 PM   #10
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I built the same preamp using my own layout. It's one of the best-sounding phono preamps I've ever owned. This is a photo of the preamp circuitboard. It's mounted in an aluminum enclosure.
Attached Images
File Type: jpg Phono Preamp 2000.jpg (328.0 KB, 270 views)
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