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Old 18th July 2008, 06:39 PM   #1
Stee is offline Stee  Italy
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Default Balanced XLR source RIAA

hello
see my idea to have perfect balanced signal
from MC cartridge
with new cable
and four channel RIAA
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Old 18th July 2008, 09:58 PM   #2
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This doesn't fill me up with confidence.
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Old 18th July 2008, 10:28 PM   #3
mlloyd1 is offline mlloyd1  United States
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indeed ...

that is a lot of components to match and there are likely more elegant and higher performance approaches available.

but, who am i to say.
give it a go and let us know how it works out ...

best regards,
mlloyd1
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Old 19th July 2008, 11:15 AM   #4
Stee is offline Stee  Italy
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Default Balanced Source is the Way

yes sure

I will test and upgrade...

really the news is
connect MC in balanced mode

to have better performance
also for filter and other chain...
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Old 19th July 2008, 12:24 PM   #5
SY is offline SY  United States
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Running the cartridge balance is a very good idea (says the guy who runs his cartridge balanced). These are just not good implementations. The second one will have degraded noise performance.

There are (to my knowledge) two good ways to do it. One is to build a fully differential phono input, the other is to use a transformer at the input and run the primary balanced. The secondary can then drive the input of a conventional single-ended stage. You get 99% of the balanced advantage that way.
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Old 19th July 2008, 12:34 PM   #6
Stee is offline Stee  Italy
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Default thanks <SY>

do you have a schematic of fully differential one?

http://www.esafono.it/diff.jpg
this is just a project with OPA1632
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Old 19th July 2008, 12:39 PM   #7
SY is offline SY  United States
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Only with tubes, but I'll bet there's a transistorized one around the forum somewhere. The "search" function is your friend.

Here's an example of a tube one:

http://www.vacuumstate.com/schematics/rtp3c_s.gif

edit: The one you linked to looks much better.
edit edit: "Better" than the first one, not better than the Vacuum State one; sorry to be ambiguous.
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Old 19th July 2008, 12:44 PM   #8
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You can get some good, working ideas here
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Old 19th July 2008, 07:30 PM   #9
Stee is offline Stee  Italy
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Default thesis: balancing improves

to see if the hypothesis is correct
I did a simple test that anyone can repeat at home

steps:

listen a preferred song only from one channel
for example the right channel

turn off everything

connect the left channel wire on cartridge instead of ground wire
and connect the negative pole of right loudspeaker
on left output of the amplifier

push on everything

hear the same song...

I believe the difference is very significant :

the sound is more dynamic
treble are more crystalline
the noise is reduced!
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Old 19th July 2008, 07:37 PM   #10
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Lovely picture

It seems you are listening to the entire chain balanced now, not just the phono. Difficult to know how much of the improvement is due to the phono stage but interesting all the same. No hum?
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