Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Building a Pearl 2
Building a Pearl 2
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th March 2020, 05:18 PM   #1781
McQuaide is offline McQuaide  United States
diyAudio Member
 
Join Date: Jan 2011
Location: Southeastern Pennsylvania
Quote:
Originally Posted by PhopsonNY View Post
Thanks a lot, McQuaide and Codyt.
It is quite clear about c13 and c8

So add a 220 cap between r14 and ground?
It is not clear on your images, but I could just lift the board edge side leg of R14 and add the cap there would be my simplest option.
I put in a 47uF, I don't think the value is critical.
__________________
Mark
  Reply With Quote
Old 17th March 2020, 05:24 PM   #1782
codyt is offline codyt  United States
diyAudio Member
 
codyt's Avatar
 
Join Date: Aug 2019
Location: Indiana
Quote:
Originally Posted by PhopsonNY View Post
Thanks a lot, McQuaide and Codyt.
It is quite clear about c13 and c8

So add a 220 cap between r14 and ground?
It is not clear on your images, but I could just lift the board edge side leg of R14 and add the cap there would be my simplest option.
Hereís a pic
Attached Images
File Type: jpeg A87DF755-52DD-422B-902E-EACE0AEB243A.jpeg (328.1 KB, 194 views)
  Reply With Quote
Old 17th March 2020, 05:46 PM   #1783
PhopsonNY is offline PhopsonNY  United States
diyAudio Member
 
PhopsonNY's Avatar
 
Join Date: Feb 2002
Location: New York
Fantastic guys...
Thanks... perfectly clear and a nice little weekend project.
  Reply With Quote
Old 18th March 2020, 02:17 PM   #1784
jackinnj is offline jackinnj  United States
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Building a Pearl 2
The first image is from Morrison's "Ground and Shielding Techniques in Instrumentation", the second from Linear Tech (ADI) AN-159 "Measuring 2nV/RtHz Noise", third the shielded box I use for noise measurements -- I can measure down to ~500pV/RtHz
Attached Images
File Type: jpg Shielding_Morrison.jpg (57.0 KB, 167 views)
File Type: jpg Shielding_LinearTech.jpg (57.0 KB, 157 views)
File Type: jpg Shielding_Box.jpg (152.5 KB, 160 views)

Last edited by jackinnj; 18th March 2020 at 02:24 PM.
  Reply With Quote
Old 25th March 2020, 10:16 PM   #1785
exojam is offline exojam  United States
diyAudio Member
 
Join Date: Jun 2007
Well I finished everything up and plugged everything together, fired it up and no sound.

I am running from the TT RCA’s to the Pearl 2 inputs. Pearl 2 output to the B1 input. B1 output to the RCS’s. I did away with the B1 selector switch so I have a jumper on R1/L1 to the middle pad. I did not remove R101 or R201 on the B1 as I do not believe it is necessary to do so.

I will have to look into a bit later and see what is going on.

I know I have 30+, 30- going to both Pearl boards and 0 at the checking offset (I believe) test point. LED’s are on, on all three boards.
  Reply With Quote
Old 25th March 2020, 10:49 PM   #1786
McQuaide is offline McQuaide  United States
diyAudio Member
 
Join Date: Jan 2011
Location: Southeastern Pennsylvania
Quote:
Originally Posted by exojam View Post
Well I finished everything up and plugged everything together, fired it up and no sound.

I am running from the TT RCAís to the Pearl 2 inputs. Pearl 2 output to the B1 input. B1 output to the RCSís. I did away with the B1 selector switch so I have a jumper on R1/L1 to the middle pad. I did not remove R101 or R201 on the B1 as I do not believe it is necessary to do so.

I will have to look into a bit later and see what is going on.

I know I have 30+, 30- going to both Pearl boards and 0 at the checking offset (I believe) test point. LEDís are on, on all three boards.
Here are some voltages to check.
Attached Files
File Type: pdf Pearl2Votages.pdf (45.9 KB, 17 views)
__________________
Mark
  Reply With Quote
Old 25th March 2020, 11:11 PM   #1787
exojam is offline exojam  United States
diyAudio Member
 
Join Date: Jun 2007
TY!
  Reply With Quote
Old 25th March 2020, 11:15 PM   #1788
KevinHeem is offline KevinHeem  United States
diyAudio Member
 
KevinHeem's Avatar
 
Join Date: Nov 2007
Location: Hudsonville, MI
Building a Pearl 2
@exojam
I completed a build one time and had the inputs and outputs swapped...silly I know. The point is, pictures would help us spot any build errors.
  Reply With Quote
Old 26th March 2020, 12:29 PM   #1789
Russellc is offline Russellc  United States
diyAudio Member
 
Join Date: Mar 2003
Location: midwest
Building a Pearl 2
Quote:
Originally Posted by WBS View Post
Sounds like a flashback to my early 1970s days!

Hmmmm, I don't remember what it sounded like, but mine and another member or two that used certain MC, mine an SAE had a mismatch problem. A simple Zobel on the input resolved the problem. 6L6 came up with the "cure" for it as I recall.

Russellc
__________________
Pass B-1 preamp, Pass BA3 preamp, Wayne's 2018 LS, Pass F-5 Amp, Pass F-6 Amp, Pass BA-3 Amp, Pass M-2 amp, Pass Aleph J amp, Pass Pearl 2 Phono pre Tekton Enzo, Altec A7, Econowave JBL 2235H & B&C CD
  Reply With Quote
Old 26th March 2020, 01:25 PM   #1790
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Building a Pearl 2
Russellc - I didn't come up with the cure, I just picked up the phone and asked Wayne... Some High-Output MC cartridges have a lot of turns on the motor and their inductance can start to ring looking into the loading resistor. The input Zoble fixes that if needed, but the couple of people who have have that problem have had the exact same cartridge!

exojam - please post some photos. (Well-lit, in-focus, you know the drill... )
  Reply With Quote

Reply


Building a Pearl 2Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
RIAA caps for Pearl and Pearl 2 AudioLapDance Pass Labs 7 22nd May 2015 07:19 PM
pearl HELP! d to the g Pass Labs 24 31st May 2007 01:56 PM
Pearl need help dzkh63 Pass Labs 1 26th September 2006 03:16 PM
Anyone building a pearl phono soon? mattjk Pass Labs 8 24th March 2005 12:20 AM
The Pearl-X Vince Maida Pass Labs 12 28th July 2002 07:28 AM


New To Site? Need Help?

All times are GMT. The time now is 07:36 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki