RIAA Head Amp Models (Phono Preamp) with only balanced XLR-Cannon Input Sockets - diyAudio
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Old 5th July 2012, 05:24 PM   #1
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Default RIAA Head Amp Models (Phono Preamp) with only balanced XLR-Cannon Input Sockets

I am looking for an overview of all models like the Jeff Rowland Cadence - go to
http://jeffrowlandgroup.com/Docs/CadenceManual.pdf
i. e. without unbalanced input sockets like RCA/cynch or BNC.
Who know such models so as the associated schematics - both as commercial products and diy projects.
On this forum I find only this:
Balanced XLR source RIAA
THE TRUE BALANCED SOURCE
balanced RIAA amp
OPA1632 for balanced RIAA preamp.?
Thank you very much for advices.

Last edited by tiefbassuebertr; 5th July 2012 at 05:26 PM.
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Old 6th July 2012, 11:28 AM   #2
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As I note by my own websearch, there are only RIAA head amps with both kind of input sockets - i. e. balanced and unbalanced. But even such models are rare and not easy to find.

Here my URL-Overview:

Elektor "MC Vorverstärker" (MAT03/OP27 - issue in Germany: 1991, march, page 22)
ImageShack® - Online Photo and Video Hosting
Elektor mc phonopreamp
The Vacuum State Electronics RTP3 preamplifier
The Vacuum State Electronics Realtime preamplifier
“La Bohème ” (Klaus Böning)
schematics
German summary
Ultra-Low-noise-MC-Vorverstärker
http://www.transkommunikation.ch/dat...erstaerker.pdf
Thel Phono-X
Phonovorstufe von THEL
Mark Kelly's Balanced Phono Preamp
Mark Kelly's Balanced Phono Preamp
AQVOX Phono 2 Ci - part 1
AQVOX Phono 2Ci balanced current-mode MM/MC phonostage - Part 1 [English]
Emmeline XR-10B
Emmeline XR-10B - Ray Samuels Audio
Audio Note M2
Audio Note M2 Balanced Phono preamplifier | Stereophile.com
BAT VK-P10SE
http://www.balanced.com/products/pho...0SE/index.html

Basics:
Tube CAD Journal: Tube balanced phono stage, July 1999
Balanced input stage beneficial for unbalanced turntables?
Minimalist balanced phono preamp?
current amplifying phono stage
balanced phono stage?
Turntable Forum • balanced phono stage
AudiogoN Forums: What phono preamps are balanced
Ayre Acoustics Phono Cables

Last edited by tiefbassuebertr; 6th July 2012 at 11:31 AM.
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Old 6th July 2012, 04:01 PM   #3
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Here with XLR only, the FM Acoustics FM 222
FM ACOUSTICS LTD. ***:*:*** FM 222
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Old 6th July 2012, 04:07 PM   #4
grufti is offline grufti  United States
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SY's His Master's Noise phono preamp is balanced. You can read his very detailed article about it on this site.
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Old 6th July 2012, 05:07 PM   #5
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Quote:
Originally Posted by grufti View Post
SY's His Master's Noise phono preamp is balanced. You can read his very detailed article about it on this site.
mean you this URL ?
His Master's Noise: A Thoroughly Modern Tube Phono Preamp
Quote:
Originally Posted by Groove-T View Post
Here with XLR only, the FM Acoustics FM 222
FM ACOUSTICS LTD. : : FM 222
Thank you for this advice:
http://www.fmacoustics.com/pdf/dat_2223.pdf
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Old 7th July 2012, 04:14 AM   #6
grufti is offline grufti  United States
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Yes.

Quote:
Originally Posted by tiefbassuebertr View Post
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Old 7th July 2012, 08:50 AM   #7
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Quote:
Originally Posted by tiefbassuebertr View Post
Quote:
Originally Posted by grufti View Post
Yes.
Thank you for this advice.
I read there:
OK, I'll begin by turning off half my readers- the design will use an input transformer. This "impure" approach carries too many advantages to ignore, including nearly noise-free gain, galvanic isolation, and the opportunity to run the phono cartridge in a balanced mode without doubling the tube count. Running balanced inputs is an amazingly powerful technique to reject common-mode noise and is common studio practice for low-level mike signals.
Until now I always assumed, that such transformers was only helpful in cases, where a MC cartridge is in use (for step-up).
But obviously such transformers are otherwise also very helpful, especially for upgrade already exist tube RIAA head amps to get GND-free balanced inputs. Indeed - a very interesting approach.

Because there are a wide range of transformers on the marked, the main question is now for me follow:
What transformer is the best ??

Last edited by tiefbassuebertr; 7th July 2012 at 08:54 AM.
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