Humble Aleph-X from the Netherlands - diyAudio
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 21st December 2003, 04:37 PM   #1
Taco is offline Taco  Netherlands
diyAudio Member
 
Join Date: Nov 2002
Location: Place in the Netherlands
Thumbs up Humble Aleph-X from the Netherlands

Atlast I have some pictures before the second group buy pcb's are distributed. The following pictures show a baby Aleph-X with 17Volt rails and 4,5 A bias. The transformers are from Reichelt and are 330 VA dual 15V. I used four irfp240 for each channel. With the 17Volt rails things get pretty hot, so I blew some stuff before I got this result . But replacing the heatsinks and making these mono's things worked out fine. The C-R-C filter in the powersupply is 47.000uF - 0.28 Ohm- 47.000uF for both the plus and minus rail. But enough text, here are the pictures:

The front of one mono:
Click the image to open in full size.

The interior:
Click the image to open in full size.

The backside:
Click the image to open in full size.

Also I finished my Balanced Linestage (still to be X-ed):
Click the image to open in full size.


Thanks to Nelson, Grollins, Edwin, Netlist and others for their help.
  Reply With Quote
Old 21st December 2003, 04:50 PM   #2
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Nice job Taco,
I like the grills on top.
Don't the 0.28 ohm resistors get too hot?
Is it two 0.28 parallel?
How silent is the output?

Any impressions of the sound?

/Hugo
  Reply With Quote
Old 21st December 2003, 04:51 PM   #3
diyAudio Moderator Emeritus
 
roddyama's Avatar
 
Join Date: Jan 2002
Location: Michigan
Default Humble?... To Be Proud For Sure!

Great Job Taco.

You don't need to be humble about that effort.

Tell us how it sounds.
__________________
Rodd Yamashita
  Reply With Quote
Old 21st December 2003, 05:09 PM   #4
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
A fine job Taco. Nice and compact.

I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. )

How does it sound, and hot does it run?

Cheers,
Dennis
  Reply With Quote
Old 21st December 2003, 05:28 PM   #5
diyAudio Moderator Emeritus
 
roddyama's Avatar
 
Join Date: Jan 2002
Location: Michigan
Quote:
Originally posted by Dennis Hui
I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. )

Dennis
Hi Dennis,

Check here under "Raw Materials and Springs-Metals-Metal and Thermoplastic Cloth and Perforated Sheets":
http://www.mcmaster.com/
http://www.mcmaster.com/param/asp/ps...8=521,158=6215
__________________
Rodd Yamashita
  Reply With Quote
Old 21st December 2003, 05:31 PM   #6
diyAudio Member
 
Join Date: Aug 2002
Location: Toronto, Canada
Quote:
Originally posted by roddyama

Hi Dennis,

Check here under "Raw Materials and Springs-Metals-Metal and Thermoplastic Cloth and Perforated Sheets":
http://www.mcmaster.com/
http://www.mcmaster.com/param/asp/ps...8=521,158=6215

Rodd,

Thanks a bunch!

Dennis
  Reply With Quote
Old 21st December 2003, 05:59 PM   #7
diyAudio Member
 
promitheus's Avatar
 
Join Date: Jan 2001
Location: Germany
Looks very nice.
Which boards are those?
The famous Aleph-X boards which are being ordered again?
How much power did you get with 4 Mosfets?
  Reply With Quote
Old 21st December 2003, 06:07 PM   #8
Taco is offline Taco  Netherlands
diyAudio Member
 
Join Date: Nov 2002
Location: Place in the Netherlands
Quote:
Originally posted by Netlist
Nice job Taco,
I like the grills on top.
Don't the 0.28 ohm resistors get too hot?
Is it two 0.28 parallel?
How silent is the output?

Any impressions of the sound?

/Hugo
The sound is compared to my JLH + BOZ combo much more open and transparant. The imaging is just magic. The resistors are two 10 Watt 0.56 Ohm resistors parallel and it is about 40 -50 degrees Celsius. The amplifier is very very very very silent. I can't hear a thing. If I turn on the preamp I can hear the noise of the preamp (holding my ear against the tweeter). But I must confess that my speakers have a sensitivity of about 85 db/W/m. (But my room is only 25 m^2, still a student in a small country ).


Quote:
Originally posted by Dennis Hui
A fine job Taco. Nice and compact.

I too like the grill top. I'm looking for something
like that for my next amp. (Haven't found the
grill material though. )

How does it sound, and hot does it run?

Cheers,
Dennis
The whole chassis warms up to about 25 -30 degrees above ambient.

Promitheus: This are the famous Aleph-X boards, output power is about 40 Watt according to calculations, 17Volt + bias of 4,5 A. (see for excel-sheet elsewhere)
  Reply With Quote
Old 22nd December 2003, 08:54 AM   #9
hifiZen is offline hifiZen  Canada
diyAudio Member
 
hifiZen's Avatar
 
Join Date: May 2001
Location: Mountain View, CA
Ooooh, CRC filter, and a clean, tight chassis layout. Looks like some really nice metalwork, too.

Nicely done indeed, Taco!
__________________
- Chad.
  Reply With Quote
Old 22nd January 2004, 02:07 PM   #10
diyAudio Member
 
CheffDeGaar's Avatar
 
Join Date: Feb 2003
Location: Safe and sound
Oops, almost missed this one !

Very nice job, Taco !
I know the amp is dead silent, but weren't you afraid by locating the IEC inlet so close to the inputs ?. It's something I search to avoid, but surely the balanced connection helps a lot

Quote:
Originally posted by Taco
The sound is compared to my JLH + BOZ combo much more open and transparant. The imaging is just magic.
Yes ! Yes ! Exactly what I feel, and it's becoming more and more obvious as the amps (or my ears and brain ???) break in

Congrats again.
__________________
/Cheff - Falling feels like flying, until you hit the ground
  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
Greetings from the Netherlands! andriesva Introductions 3 22nd February 2008 06:58 PM
Hello from The Netherlands halfgaar Introductions 1 25th March 2005 07:27 AM
Greetings from the Netherlands E. Pardaans Introductions 5 27th November 2004 02:48 PM
Also from the netherlands Sebastiaan Introductions 3 14th September 2004 04:40 PM
New from the Netherlands martijn Introductions 5 2nd December 2003 10:28 PM


New To Site? Need Help?

All times are GMT. The time now is 09:01 AM.


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