RIAA Head Amp Models (Phono Preamp) with only balanced XLR-Cannon Input Sockets

[tiefbassuebertr]

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:
http://www.diyaudio.com/forums/analog-line-level/126579-balanced-xlr-source-riaa.html
http://www.diyaudio.com/forums/digital-source/207602-true-balanced-source.html
http://www.diyaudio.com/forums/tubes-valves/189279-balanced-riaa-amp.html
http://www.diyaudio.com/forums/analogue-source/35467-opa1632-balanced-riaa-preamp.html
Thank you very much for advices.

 

[tiefbassuebertr]

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/da...ircuits/Ultra Low-Noise MC Vorverstaerker.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/phono/Vk-P10SE/index.html

Basics:
Tube CAD Journal: Tube balanced phono stage, July 1999
http://www.diyaudio.com/forums/anal...t-stage-beneficial-unbalanced-turntables.html
http://www.diyaudio.com/forums/analogue-source/55543-minimalist-balanced-phono-preamp.html
http://www.diyaudio.com/forums/anal...rent-amplifying-phono-stage-4.html#post378122
http://www.diyaudio.com/forums/analogue-source/37132-balanced-phono-stage.html
Turntable Forum • balanced phono stage
AudiogoN Forums: What phono preamps are balanced
Ayre Acoustics Phono Cables

 

[Groove T]

Here with XLR only, the FM Acoustics FM 222
FM ACOUSTICS LTD.    : :    FM 222

 

[grufti]

SY's His Master's Noise phono preamp is balanced. You can read his very detailed article about it on this site.

 

[tiefbassuebertr]

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 ?
http://www.diyaudio.com/forums/diya...oise-thoroughly-modern-tube-phono-preamp.html

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

 

[grufti]

Yes.

mean you this URL ?
http://www.diyaudio.com/forums/diya...oise-thoroughly-modern-tube-phono-preamp.html

 

[tiefbassuebertr]

mean you this URL ?
http://www.diyaudio.com/forums/diya...oise-thoroughly-modern-tube-phono-preamp.html

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 ??

 

[tiefbassuebertr]

any news?

 

[hazard500]

any news?

If you are after a fully differential RIAA stage (just like the Jeff Rowland unit) then I HIGHLY RECOMMEND the design by forum member polyphaze.

http://www.diyaudio.com/forums/analogue-source/289428-phobos-balanced-mc-phono-stage.html

Key advantages are:
1. Its high gain. No SUT required (nonetheless its still fully differential input.
2. Its differential all the way. The design quoted before by SY is a wonderful design, BUT it is singe ended. Yes it has a balanced input by virtue of its transformer, but everything down stream is single end.

I am getting the parts together to build this and will assemble in the next few weeks. So I haven't listened to it yet, but i am confident that this will be a winner.