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.

Aleph J illustrated build guide
Aleph J illustrated build guide
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 20th May 2019, 03:30 AM   #3641
6L6 is offline 6L6  United States
diyAudio Moderator
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Aleph J illustrated build guide
Don't need anything extra but the switch.

Hmmm... It's actually a very interesting idea. The biggest thing that immediately comes to mind is make sure it's powered off when you throw that switch, but aside that, It's not ringing any alarm bells in my head.

Start a thread, take a bunch of photos and go for it.
  Reply With Quote
Old 20th May 2019, 06:00 AM   #3642
Zen Mod is offline Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Aleph J illustrated build guide
I don't like idea of switching high DC inrush currents

maybe using solid state relays, so small 3PDT toggle switch operating them

besides that , it comes to my mind - each channel (of 2+2) having own dedicated speaker , or you intend to drive just one pair , using different amp for different mood ?
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 20th May 2019 at 06:02 AM.
  Reply With Quote
Old 20th May 2019, 07:44 AM   #3643
Extreme_Boky is offline Extreme_Boky
diyAudio Member
 
Join Date: Dec 2003
Modify the biasing circuit to cut-out an undesired module class A bias.
  Reply With Quote
Old 20th May 2019, 08:12 AM   #3644
Itsmee is offline Itsmee  England
diyAudio Member
 
Itsmee's Avatar
 
Join Date: Feb 2009
Aleph J illustrated build guide
Quote:
Originally Posted by aljordan View Post
...set up the two chassis so that each has an M2 board and an Aleph J board...
Forget the switch, biamp.
  Reply With Quote
Old 21st May 2019, 06:17 PM   #3645
Mazeppa is offline Mazeppa  United States
diyAudio Member
 
Mazeppa's Avatar
 
Join Date: Mar 2009
Location: Harrison, Arkansas
Aleph J illustrated build guide
Quote:
Originally Posted by Zen Mod View Post
I don't like idea of switching high DC inrush currents

Yes indeed, DC is difficult to switch safely.
6L6 addressed that adequately.


maybe using solid state relays, so small 3PDT toggle switch operating them

besides that , it comes to my mind - each channel (of 2+2) having own dedicated speaker , or you intend to drive just one pair , using different amp for different mood?

Good question. I've pondered having a system that could be readily switched from rock and roll amp/speakers to singer and guitar amp/speakers.
Bit of a stretch highly contingent on whether 2 pair speakers could be properly placed in the same listening area. At any rate, I'll have to wait until I retire to pursue the notion. Probably best to keep working toward a system that does everything well.
__________________
CD transport<Schiit Gungnir Multibit DAC<Schiit Saga Pre<ACA's in mono parallel<Tekton Lore Reference or Omega Super 3XRS
  Reply With Quote
Old 21st May 2019, 06:18 PM   #3646
Mazeppa is offline Mazeppa  United States
diyAudio Member
 
Mazeppa's Avatar
 
Join Date: Mar 2009
Location: Harrison, Arkansas
Aleph J illustrated build guide
Quote:
Originally Posted by 6L6 View Post
Don't need anything extra but the switch.

Hmmm... It's actually a very interesting idea. The biggest thing that immediately comes to mind is make sure it's powered off when you throw that switch, but aside that, It's not ringing any alarm bells in my head.

Start a thread, take a bunch of photos and go for it.
+1
__________________
CD transport<Schiit Gungnir Multibit DAC<Schiit Saga Pre<ACA's in mono parallel<Tekton Lore Reference or Omega Super 3XRS
  Reply With Quote
Old Today, 01:13 AM   #3647
Mazeppa is offline Mazeppa  United States
diyAudio Member
 
Mazeppa's Avatar
 
Join Date: Mar 2009
Location: Harrison, Arkansas
Aleph J illustrated build guide
Default Success!

Quote:
Originally Posted by KevinHeem View Post
I know on Pearl II projects people have had problems in the past with the ZTX450 going bad due static electricity before/during installation. Maybe you should try replacing all three ZTX components.
Replaced Q2,3,4 in board #1.
Fired it up, and whaddaya know, readings across source resistor and DC offset were in the ballpark.

Did anybody hear my whoop and holler?

Adjusted R27 to .350v across source resistor, DC offset is .035v.
1/2 hr warmup, adjusted to .400v and .000v.
Lid on for another 1/2 hr; adjusted bias from.384 to .400, offset from.005 to .000.
Checked board #2 bias .378, adjusted to .400, offset from .005 to .000.

Power down, take the wife out to supper.

Power up, bias on both sides .430-ish, did not adjust, offsets .003-ish, did not adjust. Power down.
Connect test speakers and Spotify, power up and we have clean music from not one, but TWO channels.
Zero turn on thump, or noise of any kind. 1rst song through a new amp is a big deal, Jimi Hendrix got the job with "All Along the Watchtower".
Oooh-la-la, can't stop grinning.

Many thanks to the group for the help and encouragement.
__________________
CD transport<Schiit Gungnir Multibit DAC<Schiit Saga Pre<ACA's in mono parallel<Tekton Lore Reference or Omega Super 3XRS
  Reply With Quote
Old Today, 01:22 AM   #3648
Dennis Hui is offline Dennis Hui  Canada
Hoopy Frood
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Aleph J illustrated build guide
Congratulations!
__________________
We are fearless amplifier builders. A little heat doesn't scare us at all.
- NP 2002
  Reply With Quote
Old Today, 01:56 AM   #3649
WKCox is offline WKCox  United States
diyAudio Member
 
WKCox's Avatar
 
Join Date: Mar 2004
Location: Verona, WI
Aleph J illustrated build guide
Great to hear you solved the problem! Now relax with more Hendrix and a bit of Cream.
__________________
Pass F5, M2x, ACA, B1, B1 Korg; Audio Research ST-70-C3; Dynaco ST-35; Audio Electronic Supply SE-1; Elekit TU-8500; Hagerman Bugle; Scan-Speak Solist MTM; Selah SA-1; Seas Loki; Cavalli eXStatA; Millett Hybrid MAX, Hybrid MiniMAX
  Reply With Quote
Old Today, 02:17 AM   #3650
Russellc is offline Russellc  United States
diyAudio Member
 
Join Date: Mar 2003
Location: midwest
Aleph J illustrated build guide
There you go. This is a great amp, one of the best. Congrats.

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

Reply


Aleph J illustrated build guideHide 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
An illustrated guide to building an F5 6L6 Pass Labs 1185 4th April 2019 03:42 AM
MyRefC build guide AndrewT Chip Amps 1119 29th July 2016 10:30 PM
An illustrated guide for Aleph 60 builders PKI Pass Labs 58 12th October 2013 07:13 PM
Aleph J Stuffing guide ? thor61 Pass Labs 2 4th September 2011 08:02 PM
My first step by step LM3886 illustrated build kgb_m3 Chip Amps 19 17th February 2010 04:46 PM


New To Site? Need Help?

All times are GMT. The time now is 03:20 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki