Phono MC/MM who is running balanced? - diyAudio
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Old 11th November 2010, 04:28 PM   #1
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Default Phono MC/MM who is running balanced?

Just to thave an Idea who is running balanced cartridges.

I mean the tone arm revired to run the cartridge in to a balanced input MC/MM phono stage.

Al
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Old 23rd November 2010, 03:12 PM   #2
rjm is offline rjm  Japan
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The wiring is the same whether to balanced or unbalanced, it's just the connectors that change.

A balanced phono stage has, all things being equal, a 3 dB higher noise floor.. for the simple reason that the input signal seen by the + and - inputs with respect to ground is only half the the full voltage, while an unbalanced input sees the full voltage. (each input has 6dB more noise (or 6dB less signal for the same gain, if you prefer), but some of that noise cancels at the output together with the common mode noise, end result +3 dB)

Where low input noise is the primary concern (and for a phono stage, it should be) unbalanced is the preferred circuit topology.
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Old 23rd November 2010, 04:02 PM   #3
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Quote:
Originally Posted by Bksabath View Post
Just to thave an Idea who is running balanced cartridges.
Yo.

The motive is to run the whole enchilada balanced: re-re, reamp, ower amp. Is what i do, my rime TT has re-installed balanced outputs, yet to see a 2d standard-issue model.
Not unusual if one lives in the balanced zone.
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Old 23rd November 2010, 04:19 PM   #4
PMA is offline PMA  Europe
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I sold a balanced MC phono preamp design for commercial purposes this year.
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Old 23rd November 2010, 04:29 PM   #5
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I published a balanced Phonostage in Jan Diddens Linear Audio Volume 0.
Yes, the wires are the same but you need other connectors. Non of the wires from the cartridge should be connected to ground, only the shield.
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Old 23rd November 2010, 04:53 PM   #6
SY is offline SY  United States
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Me. I use four pin DIN plugs.
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Old 23rd November 2010, 04:54 PM   #7
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Quote:
Originally Posted by rjm View Post

A balanced phono stage has, all things being equal, a 3 dB higher noise floor..
The trick is to make all things NOT be equal!
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Old 23rd November 2010, 05:04 PM   #8
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It's not even important to use different connectors, the standard RCA plug & socket works just fine as long as it's not earthed anywhere - if the electronics are fully balanced.

Our fully balanced RTP3D preamp has three phono inputs:

1. balanced XLR

2. balanced REDEL/Lemo, our house preference - simply the best sounding audio connector we have found

3/ a floating RCA socket which makes a perfect interface with 99% of good MC cart RCA equipped tone arms And even if the cable is a shielded unbalanced cable, as long as it's not grounded, I've never had any hum or other problems.

Regards, Allen
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Old 23rd November 2010, 05:10 PM   #9
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In case you want to make a serious design, you have to assign the balanced preamp ground.
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Old 23rd November 2010, 05:26 PM   #10
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I do. My whole system is balanced and I rewired my Thorens turntable.
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