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Old 19th July 2008, 08:43 PM   #11
Stee is offline Stee  Italy
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Default 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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Old 19th July 2008, 10:52 PM   #12
Stee is offline Stee  Italy
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sorry the output of last schematic is unbalanced

ideal for unbalanced input amp but with balanced out
http://www.esafono.it/Esafono_Tandem.pdf
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Old 9th September 2008, 09:41 PM   #13
mzperx is offline mzperx  Hungary
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Default FullyDiff (MC) RIAA

At the moment I'm thinking in building of this version with fully smd technology.
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Old 10th September 2008, 05:12 PM   #14
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Default very intresting

thanks
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Old 10th September 2008, 07:13 PM   #15
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Quote:
Originally posted by SY
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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Old 10th September 2008, 08:07 PM   #16
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Default good idea

but what is his complementary?
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Old 11th September 2008, 05:11 PM   #17
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This is from Tubecad http://www.tubecad.com/2007/09/blog0120.htm

adapted a bit for the situation -- so full credit to Broskie

Click the image to open in full size.
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Old 11th September 2008, 06:34 PM   #18
mzperx is offline mzperx  Hungary
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This circuits has very poor CMRR at low frequency. And C1/C5 pairs have to be well matched in order to avoid further CMRR degradation and to keep theoretical 40dB CMRR.
//That's why I choose OPA1632 into 2nd position.
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Old 5th October 2008, 06:16 PM   #19
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Default more easy is have twice preamp

hello
an easy solution to have balanced signal
and more and more harmonics?

but two NAD PP2 phono preamplifier
and modify your connection to the pick-up

need also two amplifier
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Old 6th October 2008, 05:25 AM   #20
EUVL is offline EUVL  Europe
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> Differential DIY OPAMP -- Scott Wurcer posted under "Measuring Low Noise"

Can you kindly post a link please.


Thanks,
Patrick
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