X100 backengineered here - Page 15 - 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 3rd January 2002, 02:01 AM   #141
hifi is offline hifi  Sweden
diyAudio Member
 
Join Date: Mar 2001
Location: sweden
it would be nice if you could mail me that layout (for the pearl phono)

/micke
  Reply With Quote
Old 19th February 2002, 08:56 PM   #142
diyAudio Member
 
Join Date: Feb 2002
Location: Sweden, Blekinge
Send a message via ICQ to EngelholmAudio
Hi there,

Could you, Petter mail me?

engelholm.per@telia.com

Nice if us scandinavians keep toghether! ;-D
__________________
best regards Engelholm Audio
www.engelholmaudio.com
  Reply With Quote
Old 15th April 2002, 05:18 PM   #143
diyAudio Member
 
Join Date: Dec 2001
Location: Vantaa/Finland
Hello... This thread seems to have died out or something.

Did Petter ever get his X100 to work?

I have soon big populations of Fairchild IRFP240 and IRFP9240 here (the industry standard versions), and hopefully can then start obtaining the "lesser" parts and building an X circuit of my dreams.

What I am most afraid of is that as my room's temperature (or the amplifier's internal temperature) rises some degrees, the current sources go into a mismatch and smoke comes out from everywhere.

I think we can be quite sure that NP doesn't use "triplets" in his commercial amplifiers, or I'd be at least amazed if he did. By looking at the pictures in the Pass Labs' products section I have seen only one trimpot in a single X amplifier channel. I wonder would it be any more criminal than this thread to see if I can find a real X amplifier and see what's inside. But if there really aren't any stability problems with Petter's "triplets", I might as well be happy with them. And I don't seriously think any owner of a real X amp would appreciate me opening the case of his treasure.

BTW. Do I lose anything if I use IRF610 as the input pair and forget about JFETs?

-Kimmo Sundqvist
  Reply With Quote
Old 16th April 2002, 09:20 AM   #144
diyAudio Member
 
Join Date: Jan 2001
Location: Scandinavia
I believe the most people use doublets, i.e a fixed resistor with say a 5K paralell pot. This means that if you turn the pot towards zero, you will get zero ohms.

The triplet approach basically gives you more useful turns (less sensitivity) on the turns but is by no means necessary. You can obtain a similar effect by using fixed resistor with series low value pot (say if target is 200-250 ohms, a 200 ohm unit with a 50 ohm series pot will give you maximum usage of all turns). The "Problem" with that approach is that you get all the current through the trimpot. Probably not all that much of a problem, but still ...

I thus believe triplets will give you the best result -- low power consumption in the trimpot + fairly linear use of all turns. This again leads to better stability.


A note on JFET's: If I found a better photo of the JFET pass units, I could probably see a little more. However, through the fuzz there seems to be 4 JFETS's parallelled per side (much like a double Pearl input stage) connected as a long tailed pair?

Sorry to all those who have made this thread exciting -- I have not yet had the time to complete the unit

Petter
  Reply With Quote
Old 16th April 2002, 12:37 PM   #145
diyAudio Member
 
Holger Barske's Avatar
 
Join Date: Jan 2001
Location: Ruhrgebiet
Perhaps this pic may help a little. It is the x-amp module from an X150. I hope Nelson doesn't mind if I post it here...

Holger

[image removed until further notice]
  Reply With Quote
Old 16th April 2002, 04:03 PM   #146
diyAudio Member
 
dlharmon's Avatar
 
Join Date: Nov 2001
Location: TN, USA
Default Circuit Simulation

Try searching for switchercad it's was created by a semiconductor company. It has IRFP240 and IRFP9240's (I think) - I am running linux now so I can't check. It is totally free and works well for me. The interface is different than Circuit Maker which I too tried, but it can be learned in about an hour. I think it even has tubes.

If anyone knows about a good simulator for linux I would like to know about it.

Darrell Harmon
  Reply With Quote
Old 16th April 2002, 04:16 PM   #147
Banned
 
Join Date: Feb 2002
Location: Dallas,Texas
Angry Nelson

He is going to have a fit........

H.H.
  Reply With Quote
Old 16th April 2002, 04:37 PM   #148
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Holger,

You might want to remove the picture until you get permission from Mr.Pass, to post it.

Jam
  Reply With Quote
Old 16th April 2002, 04:44 PM   #149
Banned
 
Join Date: Feb 2002
Location: Dallas,Texas
Exclamation Absolutley

Mr. Pass has been much too generous to to treat this way. I feel fairly certain that he would not want this up there. Not just hobbyist read this forum.

H.H.
  Reply With Quote
Old 16th April 2002, 04:54 PM   #150
diyAudio Member
 
Join Date: Jul 2001
Location: The Netherlands
Dear HBarske,

I feel that maybe you have crossed a thin line there. Although your efforts are much apreciated I would feel more comfortable if the photo would be removed.

T. Schrama
  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
Help needed: Firing up the Aleph-X100 Blitz Pass Labs 86 22nd September 2010 09:09 PM
Fisher x100 rudy129 Parts 0 11th February 2008 01:32 PM
Aleph DIY x100 and Wilson Audio-low impedance problem. elviukai Pass Labs 11 9th March 2006 06:36 PM
Has anyone heard of the SPL-X100 speaker? Matttcattt Car Audio 1 11th December 2003 02:58 PM


New To Site? Need Help?

All times are GMT. The time now is 02:21 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