Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 13th February 2013, 10:46 AM   #191
henryve is offline henryve  South Africa
diyAudio Member
 
henryve's Avatar
 
Join Date: Jun 2008
Location: Strand
So 220R should be par for the course on the 2SJ74s as gate stoppers as well? Note that the IRF MOSFETs already have 221R gate stoppers as per the standard Aleph J circuit diagram. (R9, R10, R11, R12).
  Reply With Quote
Old 13th February 2013, 11:34 AM   #192
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
I think its best just to stick to original numbers. I am sure anything can be tweaked to perfection, but this should happen on individual basis, as all folks builds will be different.

Initial prigin for matched quad will be $12. If using dual output pairs, as I suggest, then $24.
__________________
...Shape the sound , Man!

Last edited by buzzforb; 13th February 2013 at 11:37 AM.
  Reply With Quote
Old 13th February 2013, 11:50 AM   #193
henryve is offline henryve  South Africa
diyAudio Member
 
henryve's Avatar
 
Join Date: Jun 2008
Location: Strand
OK, the BOM has been updated yet again. Please review. Especially you buzzforb since you have been implicated.
  Reply With Quote
Old 13th February 2013, 11:52 AM   #194
henryve is offline henryve  South Africa
diyAudio Member
 
henryve's Avatar
 
Join Date: Jun 2008
Location: Strand
Arghhh damn, just after lunchtime and my brain is on siesta. BOM attached.
Attached Files
File Type: pdf BOM-Aleph-J-UMS.pdf (440.0 KB, 40 views)
  Reply With Quote
Old 13th February 2013, 11:54 AM   #195
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Perhaps attach schematic used to BOM, as it will make comparisons and reference easier. there are a couple different ones floating around.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 13th February 2013, 11:55 AM   #196
henryve is offline henryve  South Africa
diyAudio Member
 
henryve's Avatar
 
Join Date: Jun 2008
Location: Strand
I will see what I can do.
  Reply With Quote
Old 15th February 2013, 12:31 PM   #197
henryve is offline henryve  South Africa
diyAudio Member
 
henryve's Avatar
 
Join Date: Jun 2008
Location: Strand
Default BOM now Revision A

I have now moved the BOM status to Revision A.
Attached Files
File Type: pdf BOM-Aleph-J-UMS.pdf (486.3 KB, 38 views)
  Reply With Quote
Old 15th February 2013, 02:34 PM   #198
diyAudio Member
 
luvdunhill's Avatar
 
Join Date: Jul 2006
For C4, a 10uF/25V cap might fit better: RFS-25V100ME3#5.

I'll look over the rest a bit later.
  Reply With Quote
Old 15th February 2013, 02:44 PM   #199
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Spec wise, Panasonic FM is hard to beat. That says nothing of sound. Ifs it's input cap, I would stick with Elma If possible, but you may not her difference considering bypass mkp. Sorry to be guessing, but I don't know what schematic we are referencing.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 15th February 2013, 03:10 PM   #200
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
henryve -- Thanks so much for your work on this! The BOM and notes will be extremely helpful to everybody wanting to build this amp.

As for buzzforb's suggestion of attaching a schematic, I think that's a great idea, it's just that there isn't a really good one yet - the original schematic dosen't have any of the changes, and the eagle schematic that didiet used for making the PCB has a bunch of extraneous bits to facilitate the PCB drilling and pads...

Once we have the PCB tested I will make sure there is an "official" schematic for this. In the time being, didiet's is best.

Question - does anybody know what software Nelson uses for his schematics? Visually it's very appealing, I would love to have the final schematic drawn in that...
__________________
Illustrated Build Guides - Pass F4 - Pass B1 - Pass F5 - Pearl 2 - O2 HPA - Hagerman Bugle 2 - Pass Aleph J - Me at BA '13

Last edited by 6L6; 15th February 2013 at 03:25 PM.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Universal Mounting Specification rsdio Construction Tips 3 31st October 2011 11:51 AM
what is the mounting depth and mounting diameter of this? lemans23 Multi-Way 2 26th October 2005 10:52 PM
Has anybody built an Aleph-x to this spec??? D3 Pass Labs 58 16th June 2004 06:08 PM
Spec on transformer for Aleph 5? Tony D. Pass Labs 8 24th April 2002 12:49 PM


New To Site? Need Help?

All times are GMT. The time now is 08:12 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2