Pearl Phono stage

Gregorio · 12th November 2004, 11:34 PM

The parts list shows R1, C14, C16 as "User Value". I cannot find any mention of these parts in the manual or on the schematic. What do these parts do and how do I go about choosing values for them?

Also, in addition to the Vishay resistors, I noticed Mouser also sells Wima caps. Has anyone tried using Wima instead of Panasonic for the film caps?

moe29 · 13th November 2004, 12:31 AM

I guess you ran into the same problem i did when ordering parts
this week. DigiKey is out of the .15uF panasonics. Looks like they
won't be getting them in until mid-December.

I couldn't find a Wima part at .15uF on Mouser... but then again
i might have missed it - difficult to read online guide.

I have substituted a higher voltage Panasonic cap while i'm building
and have the Pearl on the bench, and will replace it when the
other part becomes available.

If someone can give part #'s and a place to buy the Wima's i'd
give them a try too.

m.

vpharris · 17th November 2004, 04:16 AM

http://www.diyaudio.com/forums/showt...180#post132180

We now have a good search engine here

steenoe · 17th November 2004, 09:20 AM

Quote:

The parts list shows R1, C14, C16 as "User Value". I cannot find any mention of these parts in the manual or on the schematic. What do these parts do and how do I go about choosing values for them?

Those components are for loading your cartridge.
It is not sure you need to install those.
You can find lots of info about this here:
http://www.passlabs.com/downloads.htm
Look for the ONO literature.

Mr. Pass is such a kind man

Steen.

paul gold · 2nd June 2005, 06:03 PM

I need to reduce the gain of the Pearl phono stage. I would like to switch to a higher output cartridge. I follow the Pearl with a line stage that has a minimum gain of 7dB because of the output transformer. I am using this in a calibrated (0VU = 7cm/sec stereo) lacquer cutting setup. So far I have been unable to get a pad to work without increased distortion.

Besides designing a correct output pad is there a way to reduce the gain by 12dB or so?

12th November 2004, 11:34 PM	#1
Gregorio diyAudio Member Join Date: Jun 2004 Location: Midwest	Pearl Phono stage The parts list shows R1, C14, C16 as "User Value". I cannot find any mention of these parts in the manual or on the schematic. What do these parts do and how do I go about choosing values for them? Also, in addition to the Vishay resistors, I noticed Mouser also sells Wima caps. Has anyone tried using Wima instead of Panasonic for the film caps? __________________ Gregorio

17th November 2004, 04:16 AM	#3
vpharris diyAudio Member Join Date: Dec 2001 Location: Philadelphia	http://www.diyaudio.com/forums/showt...180#post132180 We now have a good search engine here __________________ Vince Harris

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13th November 2004, 12:31 AM	#2
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	I guess you ran into the same problem i did when ordering parts this week. DigiKey is out of the .15uF panasonics. Looks like they won't be getting them in until mid-December. I couldn't find a Wima part at .15uF on Mouser... but then again i might have missed it - difficult to read online guide. I have substituted a higher voltage Panasonic cap while i'm building and have the Pearl on the bench, and will replace it when the other part becomes available. If someone can give part #'s and a place to buy the Wima's i'd give them a try too. m.

2nd June 2005, 06:03 PM	#5
paul gold diyAudio Member Join Date: Jun 2005 Location: Brooklyn, NY	I need to reduce the gain of the Pearl phono stage. I would like to switch to a higher output cartridge. I follow the Pearl with a line stage that has a minimum gain of 7dB because of the output transformer. I am using this in a calibrated (0VU = 7cm/sec stereo) lacquer cutting setup. So far I have been unable to get a pad to work without increased distortion. Besides designing a correct output pad is there a way to reduce the gain by 12dB or so?

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