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Building a Pearl 2
Building a Pearl 2
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Old 17th June 2017, 07:25 PM   #901
laverda is offline laverda  United Kingdom
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Out of interest, what is the preferred 22uF output cap other than a litic ?? Film/Polyprop?

TIA
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Old 17th June 2017, 07:53 PM   #902
flancfuster is offline flancfuster  Romania
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Hi,
Where did you get the self-adhesive mu-metal sheet? I want to install it to my pearl 2.

Regards

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Originally Posted by folkdeath95 View Post
Thanks.

The white thing in the case is self-adhesive mu-metal sheet.
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Old 17th June 2017, 08:22 PM   #903
folkdeath95 is offline folkdeath95  France
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Mumetal, Nikel Permalloy, Magnetic shielding foil, Sheet, Mu-metal 0.1T-a | eBay
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Old 17th June 2017, 10:50 PM   #904
Eric is offline Eric  United States
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Originally Posted by laverda View Post
Out of interest, what is the preferred 22uF output cap other than a litic ?? Film/Polyprop?

TIA
You'll have a tough time finding anything but a litic in 22uF size, but I found this cap unnecessary after adding a cap in series with R14 to ground. Just lift the ground side of R14 and connect to the + lead of the cap and the - lead goes to ground. A bipolar cap would work here also but a standard electrolytic will work.

See the discussion here
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Old 18th June 2017, 02:11 AM   #905
wayne is offline wayne  United States
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I like the mu metal shielding a nice touch and it does help.
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Old 18th June 2017, 07:23 AM   #906
folkdeath95 is offline folkdeath95  France
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Quote:
Originally Posted by Eric View Post
You'll have a tough time finding anything but a litic in 22uF size, but I found this cap unnecessary after adding a cap in series with R14 to ground. Just lift the ground side of R14 and connect to the + lead of the cap and the - lead goes to ground. A bipolar cap would work here also but a standard electrolytic will work.

See the discussion here
You can find polypro, PIO, etc... caps in 22F, but they are huge. But if Laverda has enough place in his box, he can try.

I understood that this output cap was a high-pass filter to prevent any DC to go to the next component (preamp, amp, etc...). I suppose it's possible to get rid of it if you have a input cap in your preamp, but I didn't know that the cpa in serie with R14 had the same effect.

Concerning this cap: given that R14 sets the gain, does adding a cap in serie with it changes something in the gain?
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Last edited by folkdeath95; 18th June 2017 at 07:26 AM.
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Old 18th June 2017, 07:24 AM   #907
folkdeath95 is offline folkdeath95  France
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I like the mu metal shielding a nice touch and it does help.
Thanks Wayne.
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Old 18th June 2017, 10:45 AM   #908
laverda is offline laverda  United Kingdom
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Quote:
Originally Posted by Eric View Post
You'll have a tough time finding anything but a litic in 22uF size, but I found this cap unnecessary after adding a cap in series with R14 to ground. Just lift the ground side of R14 and connect to the + lead of the cap and the - lead goes to ground. A bipolar cap would work here also but a standard electrolytic will work.

See the discussion here
...all clear now...I've already done the C in series with R14, so I'll whip out the 22uf and see.... Many thanks.
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Old 15th August 2017, 08:04 AM   #909
Wellerman is offline Wellerman
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Lately I have noticed that my Pearl 2 doubles as a tuner as among the background noise a radio station can be heard. Very low level but audible when a silent groove is played. This disappears when I disconnect the turntable. So I suspect it must have something to do with the new interconnect that was mounted on my Thorens (functions as an antenna?). Is there anything I can do to the Pearl to make it less susceptible to this?
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Old 15th August 2017, 01:31 PM   #910
McQuaide is offline McQuaide  United States
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Lately I have noticed that my Pearl 2 doubles as a tuner as among the background noise a radio station can be heard. Very low level but audible when a silent groove is played. This disappears when I disconnect the turntable. So I suspect it must have something to do with the new interconnect that was mounted on my Thorens (functions as an antenna?). Is there anything I can do to the Pearl to make it less susceptible to this?
If it disappears when you disconnect the TT, it's the TT picking up interference not the phono pre. The pre is just amplifying it. Look at the shielding of your phono from the cartridge all the way to the Pearl 2.
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