Balanced XLR source RIAA

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hello
see my idea to have perfect balanced signal
from MC cartridge
with new cable
and four channel RIAA
 

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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.
 
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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an uneconomic improvement

certainly difficult to discriminate between contributions...

now I have an economic turntable - kenwood
with economic MM head and shielded container (on the ground)
no hum

test you also
it's easy with great satisfaction

But attention
must buy a second complete electronics once heard this quality!
(or build a fully differential one)
 

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SY said:
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.

Differential DIY OPAMP -- Scott Wurcer posted under "Measuring Low Noise" -- instead of 2SK170 uses BF862.
 
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