Aleph-X builder's thread. - Page 104 - 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 17th January 2006, 02:05 AM   #1031
gilfo1 is offline gilfo1  United States
diyAudio Member
 
gilfo1's Avatar
 
Join Date: Dec 2005
Location: miami
Default ~60 Watt Aleph BOM

Regards Gentlemen,

I am a new DIYer and farily new to posting as well. Hope I am posting in the right place...

I have been searching for a BOM and advice for a 60 watt pair of Aleph X.
I think 100 watts is too hot and too much ( I live in Miami, FL ) however, I think "Grey's" 40 watt is slightly under powered.

The BOM's I have seen are from several years back and just wondering if there have been any updates or known tweaks in the mean time.

Pretty much looking to "copy cat" as I don't have too much experience nor too much time to experiment.

Thanks in advance,

Luke


BTW: I have been totally blown away by Nelson Pass. Not only his elegant and amazing designs, but his willingness to give away and share his knowledge. His white papers are truly amazing and humorous at the same time.
After reading the "EL Pipe-o" white paper ( they smoked 26" 300 watt woofers ), and seeing his Rolling Stones pix ( on this site ) I *do* hope that he is protecting his hearing!
  Reply With Quote
Old 17th January 2006, 12:12 PM   #1032
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
Going from 40W to 60W is less than 2 dB difference - with at least a 60W increase in waste heat.

Are you sure that you need the power? Look at the power you use for normal listening. I consider 90 dB pretty darned loud. I'd be surprised if you really need more than a 5-10W unless your room is huge and speakers inefficient.

The "catch" with the Aleph design is they don't like low impedance loads unless you bias for them. use the AXE-1.2 spreadsheet and see what happens to output power at low impedances. If you can use plenty of bias, it is not an issue, but then the heat load goes up.

That said, to get 60W or so, you can use the standard circuit with an additional quad of output devices (8 total), huge heat sinks and a transformer that will give you at least 18.5 volt rails loaded (14-15V secondaries ought to do) and you're in there. Set the total bias at 4 amps (0R5 source resistors)

By huge heat sinks, I mean plan on lots of metal. I have some coming for a project the size you specified that will be 7" high, 8.25" wide with 3" fins. Two of these per channel are predicted to keep my sink temperatures down to a cozy 54C with the junction temperatures at 97C. That's 18 pounds of heat sink per channel.

EDIT: BTW, the AX is a difficult first project. You might want to consider a straight aleph first, since it will be a bit easier to get running right. Although there are plenty of AX success stories out there, there are also lots of frustrated inexperienced builders.
  Reply With Quote
Old 17th January 2006, 01:20 PM   #1033
diyAudio Member
 
still4given's Avatar
 
Join Date: Oct 2004
Location: Victorville, CA
Quote:
Originally posted by BobEllis


EDIT: BTW, the AX is a difficult first project. You might want to consider a straight aleph first, since it will be a bit easier to get running right. Although there are plenty of AX success stories out there, there are also lots of frustrated inexperienced builders.

I resemble that remark
__________________
X-BoSoZ, B1 Mezmerize, ESP P101, Symasym, KSA 50 X 2 Aleph-X, Leach Low TIM, Leach Superamp, Dx MKIII, DX Super A, Honey Badger, JLH 1969, Gainclone. FetZilla, Peeceebee X2, VSSA PMI, VSSA jkuetemann, SKA GB150, Slewmonster with; CFA-XH IPS, Wolverine IPS, Spooky IPS
  Reply With Quote
Old 17th January 2006, 02:47 PM   #1034
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
But we got you through it to a working amp, right Terry?

There are plenty of people who are good at remote troublshooting who are willing to help if you get stuck. I just think you'll enjoy your project more if it works right the first time out. It will seem to sound better, too. My "works when initially powered up" projects do. Psychoacoustics at work again.
  Reply With Quote
Old 17th January 2006, 02:49 PM   #1035
gilfo1 is offline gilfo1  United States
diyAudio Member
 
gilfo1's Avatar
 
Join Date: Dec 2005
Location: miami
Default Aleph X

Hi Guys,

Thanks for the input. I guess the 40 watt will be plenty. I have a small room and efficient 8 ohm speakers... Plus I listen fairly close.

I can tell this won't be an easy build, but really want to hear the X and my not have time to build another project after this.

Thanks for your input,

Luke
  Reply With Quote
Old 17th January 2006, 03:18 PM   #1036
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
Default Re: Aleph X

Quote:
Originally posted by gilfo1
... and my not have time to build another project after this.
Ahh, but you are headed down the slippery slope, and your future will be consumed by similar projects.
  Reply With Quote
Old 17th January 2006, 04:16 PM   #1037
gilfo1 is offline gilfo1  United States
diyAudio Member
 
gilfo1's Avatar
 
Join Date: Dec 2005
Location: miami
Default Slippery Slope

Haw haw, Well I started sliding after I finished these over christmas and they actually sound good ( see pic attached )
( these are the Eros MK 2's built from Speakerbuilder.net )
They sound so detailed that I know I am hearing my Amp now.

-Luke
Attached Images
File Type: jpg dsc00548[1].jpg (61.4 KB, 758 views)
  Reply With Quote
Old 17th January 2006, 04:20 PM   #1038
steenoe is offline steenoe  Denmark
diyAudio Member
 
steenoe's Avatar
 
Join Date: Mar 2004
Very nice speakers, Luke. Good job

Steen

Edit, arent those 4 ohms? You better bias your A-X accordingly
  Reply With Quote
Old 17th January 2006, 04:35 PM   #1039
jajabin is offline jajabin  United States
diyAudio Member
 
Join Date: Jun 2004
Location: CA
Hi Luke,

very nice speakers.
How much did you spend on them?
  Reply With Quote
Old 17th January 2006, 05:41 PM   #1040
diyAudio Member
 
metalman's Avatar
 
Join Date: Jun 2003
Location: Victoria, BC, Canada
Gilfo1,

I'll echo BobEllis' remarks. I built an Aleph-X with 50W output, and with that amplifier for the most part I listen at levels of 1-2W output, and even when I crank the volume for a good rockin-out session when the wife's not home, I never using more than 10W. I have 89dB/W/m sensitivity speakers in an ~400sqft room.

Also on the amp building vs. experience level, my first project was a Zen, then moved up to building an Aleph, then graduated to building an Aleph-X. The leasons learned along the way were a major help when I had to troubleshoot the Aleph-X.

Cheer, Terry
  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



New To Site? Need Help?

All times are GMT. The time now is 01:33 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