John Linsley Hood RIAA Preamp?

roger-k · 16th March 2007, 02:17 PM

http://www.vinylengine.com/library_m...=RIAA%20Preamp

How is John Linsley Hood RIAA Preamp compared to others RIAA-preamp?
Is this worth a try?
Any who have some experience with this Preamp?

roger-k · 16th March 2007, 03:06 PM

Here is also a JLH RIAA Preamp:
http://sound.westhost.com/p25_fig2.gif

sreten · 16th March 2007, 03:21 PM

Hi,

the circuit in the article is not the circuit shown on the page
(the one you show in the 2nd post). the one in the article
is for directly drivng heaphones and is as such not ideal.

The 2nd appears to be a gain buffer, not an RIAA amplifier, see :

http://sound.westhost.com/project25.htm

/sreten.

roger-k · 16th March 2007, 06:12 PM

Ok. I see.
Is there any who have some experience with the "MC Preamp #2" on the ESP-page?

Symon · 16th March 2007, 07:41 PM

The circuit in your first post looks like the JLH Moving Coil preamp, which sits in front of the RIAA equalization section.
For this purpose the input transistors are small power devices, to provide very low input impedance.

JHL also used the same circuit to drive headphones, but in this version normal small signal devices were used fro the input and the power devices located at the output.

Cobra2 · 16th March 2007, 08:10 PM

I built this a couple of years ago.
http://www.williamshart.com/phono.htm
Doing service with a friend, wich is happy...

Arne K

16th March 2007, 02:17 PM	#1
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	John Linsley Hood RIAA Preamp? http://www.vinylengine.com/library_m...=RIAA%20Preamp How is John Linsley Hood RIAA Preamp compared to others RIAA-preamp? Is this worth a try? Any who have some experience with this Preamp? __________________ Roger

16th March 2007, 06:12 PM	#4
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	Ok. I see. Is there any who have some experience with the "MC Preamp #2" on the ESP-page? __________________ Roger

16th March 2007, 08:10 PM	#6
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	I built this a couple of years ago. http://www.williamshart.com/phono.htm Doing service with a friend, wich is happy... Arne K __________________ Ars longa, vita brevis

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16th March 2007, 03:06 PM	#2
roger-k diyAudio Member Join Date: Mar 2004 Location: Karmøy in Norway	Here is also a JLH RIAA Preamp: http://sound.westhost.com/p25_fig2.gif __________________ Roger

16th March 2007, 03:21 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, the circuit in the article is not the circuit shown on the page (the one you show in the 2nd post). the one in the article is for directly drivng heaphones and is as such not ideal. The 2nd appears to be a gain buffer, not an RIAA amplifier, see : http://sound.westhost.com/project25.htm /sreten.

16th March 2007, 07:41 PM	#5
Symon diyAudio Member Join Date: Mar 2002 Location: Herts, UK	The circuit in your first post looks like the JLH Moving Coil preamp, which sits in front of the RIAA equalization section. For this purpose the input transistors are small power devices, to provide very low input impedance. JHL also used the same circuit to drive headphones, but in this version normal small signal devices were used fro the input and the power devices located at the output.

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