Go Back   Home > Forums > >

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
Old 6th September 2021, 06:52 PM   #2811
wagner006 is offline wagner006
diyAudio Member
 
Join Date: Sep 2020
thank you: the cartridge enters a step up which enters the pearl
  Reply With Quote
Old 7th September 2021, 09:41 PM   #2812
mikebarney is offline mikebarney  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Connecticut
Default Pearl 2 new build completed

I've recently completed a new build of the Pearl 2, details here:
mpbarney - Pass pearl 2 Phono Preamp
Attached Images
File Type: jpeg IMG_2836.jpeg (290.2 KB, 207 views)
  Reply With Quote
Old 8th September 2021, 11:37 AM   #2813
wagner006 is offline wagner006
diyAudio Member
 
Join Date: Sep 2020
hello Mike
is it reversing the phase???
  Reply With Quote
Old 8th September 2021, 11:40 AM   #2814
wagner006 is offline wagner006
diyAudio Member
 
Join Date: Sep 2020
the cartridge enters a step up
or should I reverse the polarities?
at the entrance of the step up at the exit?
or at the entrance of the pearl?
  Reply With Quote
Old 10th September 2021, 01:49 PM   #2815
mikebarney is offline mikebarney  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Connecticut
Yes, this preamp reverses polarity. The easiest way to correct this is to reverse the phono cartridge leads. Reversing your speaker leads accomplishes the same thing, but if you use any other sources (tuner, tape, DAC), those will now be out of phase.
Mike

Quote:
Originally Posted by wagner006 View Post
hello Mike
is it reversing the phase???
  Reply With Quote
Old 26th September 2021, 09:19 AM   #2816
aalewis is offline aalewis  Australia
diyAudio Member
 
Join Date: Sep 2015
Location: Central Victoria, Australia
I was wanting to add a blue LED to the faceplate, and wanted same advise as to the best way to do this. Would it be OK to run it straight from the DC inputs.
Andrew
  Reply With Quote
Old 26th September 2021, 01:54 PM   #2817
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Building a Pearl 2
Of course.
  Reply With Quote
Old 26th September 2021, 04:36 PM   #2818
KevinHeem is offline KevinHeem  United States
diyAudio Member
 
KevinHeem's Avatar
 
Join Date: Nov 2007
Location: Hudsonville, MI
Building a Pearl 2
Quote:
Originally Posted by aalewis View Post
Would it be OK to run it straight from the DC inputs.
Andrew
Thatís what I did. Works fine fine for me. I really didnít have other options as I used the dual chassis approach and have no other DC point to connect. When I built a BA-3 as preamp I used raw dc at the rectifier but thatís not really an option with my Pearl II.

Youíll have a lot of voltage to contend with so a higher value resistor in front of the LED will be in order (if you want a softer look). I also prefer a 3mm blue colored LEDís rather than the clear blue for a more diffuse look. Iím learning from my mistakesÖin the Pearl II (one of my first projects) I used two 5mm clear blue LEDís without enough resistance and theyíre like headlights. I plan to revisit some day with a transistor based dimmer and swapping out the LEDís. Canít seem to get back to it with so many other projects.
  Reply With Quote
Old 26th September 2021, 04:44 PM   #2819
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Building a Pearl 2
New LED are so incredibly efficient that they need microamperes, not milliamperes to light them at a level suitable for our uses, particularly if you are looking at them straight-on.

I’d start with 1K/volt of supply for the LED resistor, (24Kohm to begin) and that might be too much. Don’t hesitate to add more series resistance to get it to a level you like, it’s just a lightbulb.
  Reply With Quote
Old 26th September 2021, 04:59 PM   #2820
KevinHeem is offline KevinHeem  United States
diyAudio Member
 
KevinHeem's Avatar
 
Join Date: Nov 2007
Location: Hudsonville, MI
Building a Pearl 2
What’s meant by “New” LED?
  Reply With Quote

Reply


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

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 09:47 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 13.64%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki