Maintaining the Aleph 0 Monoblocks - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 15th July 2011, 08:09 PM   #1
diyAudio Member
Join Date: Jul 2011
Location: London
Default Maintaining the Aleph 0 Monoblocks

Greetings from London

This is really a question for anyone who has updated the capacitors etc on circa 1994 Aleph O Monos.

To quote Nelson

'The amplifier does not require any maintenance. While the design is conservative, this is a hard running amplifier, as single ended Class A operation is the least efficient operating mode. In fifteen years the electrolytic power supply capacitors will get old. Depending on usage, you will begin to have semiconductor and other failures between 10 and 50 years after date of manufacture. Later, the sun will cool to a white dwarf, and after that the universe will experience heat death.'

I haven't seen any white dwarfs, but I think the capacitors are probably approaching journeys end and have some questions

1. Is a circuit diagram available giving the necessary values for caps and semi conductors?
2. We are thinking of using Teflon Caps and does this step meet with the designer's approval?
3. Whilst the soldering iron is heating up should we also consider replacement of the semi-conductors or leave well alone?

Any advice gratefully received.

  Reply With Quote
Old 15th July 2011, 08:50 PM   #2
Zen Mod is online now Zen Mod  Serbia
diyAudio Member
Zen Mod's Avatar
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
1. send e-mail to ><
2. why not ; yes ; even if I'm not designer
3. nope - just check all screws and condition of white thermal goo ; if needed, replace - with proper cleaning before applying new goo
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
  Reply With Quote
Old 30th August 2011, 11:09 AM   #3
kotani is offline kotani  Japan
diyAudio Member
Join Date: Dec 2009
Sorry if it's a bit late, but I am also an owner of a pair of Aleph 0. I wouldn't worry too much about replacing caps, but if I remember correctly, the transistors are matched before going in to the amp. I think replacing them will be a little difficult.
Also, I remember there being no caps in the signal path...

I hope I could be of some help...
  Reply With Quote
Old 30th August 2011, 05:12 PM   #4
diyAudio Member
tiefbassuebertr's Avatar
Join Date: Jul 2005
Location: D-55629 Schwarzerden
check also this thread:
First version Aleph 0 (Null, ZERO, O, Os, 0s) versus later Aleph versions
  Reply With Quote


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
Aleph-X monoblocks finished. steenoe Pass Labs 149 20th September 2015 02:15 AM
DIY Aleph 2 Monoblocks jritota Pass Labs 4 3rd February 2011 09:49 AM
Aleph 3 monoblocks for sale cowanrg Swap Meet 4 17th April 2007 04:37 AM

New To Site? Need Help?

All times are GMT. The time now is 01:13 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2