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Old 19th July 2013, 06:53 PM   #31
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Quote:
Originally Posted by Stefanoo View Post
One more observation:

I have run simulations for different values of the coupling caps on the MC stage, trying to substitute the 220uF caps with a 10uF first and a 30uF then.
I am not going to post this bulky posts here of course but i can report that there is a noticeable difference on the bottom end response by decreasing the values.
Therefore i guess i will go for the 220uF.
The point is that i don't like to have electrolytic caps on the signal path even though i would use a good rubycon (as far as i have read are far better than the blackgate ).
Stefano,

I know this is pretty old stuff, but I'd appreciate very much any information on this.
I too am questioning my self if 220 µF are neccessary.
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Old 24th July 2013, 01:16 AM   #32
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Quote:
Originally Posted by ticktock View Post
Stefano,

I know this is pretty old stuff, but I'd appreciate very much any information on this.
I too am questioning my self if 220 µF are neccessary.
Are you referring to the output coupling cap or to the extra DC zero?
The coupling cap is not needed if you have the star zero and you can simply trim output voltage.
You can also replace the zero with a servo.
I tried both solutions and I didn't like either one.

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Old 24th July 2013, 02:42 AM   #33
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Stefano,

I have a Pearl I with the Ono MC pre-pre boards. These come with three 220 µF
coupling caps (Pana FC each parallel with a Pana PP). I plan to replace them with
Silmic IIs and obviously lower values would help greatly. In case of the 'last' one,
which is followed by the (Pearl's) MM input of 47 KOhm, a Wima MKS or even MKP
of some µF should do the job - at least to my guessing.

Thanks in advance.
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Old 24th July 2013, 10:01 PM   #34
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The three 220uF capacitors are a bit excessive for the task and you can easily calculate the cut off frequency of the high pass filter and you will see that a simple 100uF will do more than enough.
I am not sure whether Elena would be better sounding than Panasonic FC.


For the output coupling cap, I would take it off completely.
Do you have the big electrolytic installed on the feedback? If so, just use a trimmer to trim the output DC offset and you will be good to go.
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Old 27th July 2013, 12:46 AM   #35
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THX Stefano, highly appreciate your comments. Right, they're totally excessive,
at least the last one is. This is MC ono prepre sitting on top of the Pearl I:


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


Click the image to open in full size.

Click the image to open in full size.


Looking for this stuff I also found and older revision of this, where there was just
10 µF in the output section. I have no idea why Illias then changed it to 220 µF.

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Old 27th July 2013, 02:12 AM   #36
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Built my Xono so I could bypass outputs. Didn't hear any change with or without.
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Old 27th July 2013, 02:45 AM   #37
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10uF might not b enough and 680uF might be too much.
Nelson uses 220uF if I am not wrong.
What speakers table cartridge and power amp do you have?
Is your preamp cap coupled at the input and/or output?

Last,what kind of music do you listen to?

I am asking this to determine what could be best suitable for your set up and personal taste.
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Old 27th July 2013, 05:44 AM   #38
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Quote:
Originally Posted by sakellogg View Post
Built my Xono so I could bypass outputs. Didn't hear any change with or without.
I am afraid that I won't hear any difference, too. At least we'll sleep
so much better at night with this.


Quote:
Originally Posted by Stefanoo View Post
10uF might not b enough and 680uF might be too much.
Nelson uses 220uF if I am not wrong.
If I'm not mistaken, 10 µF should be sufficient for C9, as it it followed
by the Pearl's MM input, which is 49 kOhm. A Wima MKS with a FKP3
bypass certainly is worth a try. Sadly MKP/PP caps are way too huge.


Quote:
Originally Posted by Stefanoo View Post
What speakers table cartridge and power amp do you have?
Is your preamp cap coupled at the input and/or output?
Odeon Rigoletto, LP12 with DIY-Keal, Troika MC and a pair of old Linn LK2
power amps til my Aleph Js are finally finished.


Quote:
Originally Posted by Stefanoo View Post
Last,what kind of music do you listen to?

I am asking this to determine what could be best suitable for your set up
and personal taste.
Almost all kinds of music with some preference on classic rock and jazz.
Sonically I favour "attack" and speed over "smoothness" and soundstage.
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Old 27th July 2013, 02:56 PM   #39
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Ok then based on your preference on music and current set up I would recommend the following things:

1) 10uF wima cap from mc to mm
2) trim output voltage and bypass coupling cap

This will allow you to have faster response, leaner overall faster.

Do you have bookshelf speakers or full range?
What preamp do you use? Is it cap coupled
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Old 28th July 2013, 01:38 AM   #40
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Thank you, Stefano. First I'll fit Silmic IIs and a Wima that fits for C9.

Sorry, forgot the preamp. It's an old Linn LK1 with Dirak external PSU (132.000 µF),
several mods (BYW27, FKP3, MKP4, Silmic, Cerafine).

Not mine, but the same Rigolettos:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Two way, front loaded horn, backloaded midbass. In my living room they extend down
to somewhere around 40 Hz.
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