phono pre RIAA 2001

oldeurope · 30th April 2008, 05:27 PM

http://www.diyaudio.com/forums/showt...24#post1496724

Good evening,
attached an inside view of the RIAA 2001.

Kind regards,
Darius

oldeurope · 1st May 2008, 11:41 AM

Hello,
I started a blog for this thing:
http://riaa-2001.blogspot.com/
You can see additional pictures of the RIAA pre there.
In the attached zip you find the schematic for the RIAA 2001.
This is a triode design topology. Since most people are not familiar
with triode design, I added three schematics showing opamp simplified
small signal replacements for the triode stages. I think this is helpful
to explain the RIAA2001, isn't ist?

Kind regards,
Darius

oldeurope · 7th May 2008, 06:56 PM

Whow, more than 200 views!

Thanks for your interest.

RIAA-2001

Kind regards,
Darius

sorenj07 · 7th May 2008, 08:04 PM

looks very cool! it's interesting to see you using AC heaters on a phono preamp, but if it works, it works

i'm tempted to build something like this myself.

oldeurope · 8th May 2008, 08:00 AM

Hi sorenj07,
AC heating works here because this tube has a screening between filament and g1
and the filament is bifilar.

Kind regards,
Darius

Hojvaelde · 8th May 2008, 09:05 AM

Hello oldeurope

I can see You have a SE output amplifier based on RL12T15 tubes.

Do You have any expirence with RL12P35 tubes. I have a lot of them, and want to build a 5 canal amplifier with them.

Regards

Benny

7th May 2008, 06:56 PM	#3
oldeurope diyAudio Member Join Date: Mar 2008	RIAA 2001 Whow, more than 200 views! Thanks for your interest. RIAA-2001 Kind regards, Darius

8th May 2008, 08:00 AM	#5
oldeurope diyAudio Member Join Date: Mar 2008	#4 AC heated RIAA pre Hi sorenj07, AC heating works here because this tube has a screening between filament and g1 and the filament is bifilar. Kind regards, Darius

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7th May 2008, 08:04 PM	#4
sorenj07 diyAudio Member Join Date: May 2006	looks very cool! it's interesting to see you using AC heaters on a phono preamp, but if it works, it works i'm tempted to build something like this myself.

8th May 2008, 09:05 AM	#6
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Hello oldeurope I can see You have a SE output amplifier based on RL12T15 tubes. Do You have any expirence with RL12P35 tubes. I have a lot of them, and want to build a 5 canal amplifier with them. Regards Benny