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.

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 7th February 2018, 09:14 AM   #51
Luke is offline Luke  New Zealand
diyAudio Member
 
Join Date: Sep 2001
Send a message via AIM to Luke
Quote:
Originally Posted by Zen Mod View Post
yup

I think its 24v rails and 7 amps bias? So 7/20 is 350mA per fet, X 24V is only 8.4W per device. Isn't this a waste of fets? Why not have half as many running with twice the bias? At 16W per device its still quite low dissipation for this device. Is it for ultra reliability after years of service?
__________________
If you give a man a fish he will eat for a day. But if you teach a man to fish he will buy an ugly hat. And if you talk about fish to a starving man then you are a consultant. Dilbert
  Reply With Quote
Old 7th February 2018, 09:36 AM   #52
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
if nothing else , 20 mosfets in that case ....... would look lost and unpopulated
__________________
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 9th February 2018, 04:08 PM   #53
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
FE for 5-deep

so , one big OS pcb per channel ...... so it's possible to make stereo amp in one (big) case

even other solutions possible , if one use something as Daughter boards I made for Babelfish J on Steroids (each small pcb covering 3 mosfets)
Attached Images
File Type: jpg Babelfish-XJ-FE-5-deep.jpg (162.2 KB, 358 views)
__________________
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 9th February 2018, 04:21 PM   #54
WalterW is offline WalterW  Netherlands
diyAudio Member
 
Join Date: Oct 2012
Location: Utrecht
What did you alter? The 22mA emitter follower?
__________________
Pass F5, F5Tv3, ACA, Aleph J, DDDAC1794, DCB1, BA3-preamp, VFET CSX1, Pass F6, Pass M2-HPA, VFET-X balanced, Pass J2
'If you see me talking to myself, don't worry. I'm getting expert advice'
  Reply With Quote
Old 9th February 2018, 04:31 PM   #55
MASantos is offline MASantos  Portugal
diyAudio Member
 
Join Date: May 2005
Location: Lisbon Portugal
Quote:
Originally Posted by Zen Mod View Post
FE for 5-deep

so , one big OS pcb per channel ...... so it's possible to make stereo amp in one (big) case

even other solutions possible , if one use something as Daughter boards I made for Babelfish J on Steroids (each small pcb covering 3 mosfets)
Soooo.... I have a BIG 5U case from modushop. And a nice +-30V PSU with a 600VA and 216000uf currently powering a BA3 + F4.

I believe this PSU and case fit the bill for this nice project of yours. Would you consider a OS pcb that fits the UMS mounting standard?
The 5U 400mm with standard drilling has space for 16 output mosfets, still plenty right?

Last edited by MASantos; 9th February 2018 at 04:42 PM.
  Reply With Quote
Old 9th February 2018, 04:45 PM   #56
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by WalterW View Post
What did you alter? The 22mA emitter follower?

pretty much written in few first posts:
- there is cascoded JFet input ,
-cascoded emiter followers
-servo dealing with absolute offset

Quote:
Originally Posted by MASantos View Post
Soooo.... I have a BIG 5U case from modushop. And a nice +-30V PSU with a 600VA and 216000uf currently powering a BA3 + F4.

I believe this PCB fits the bill for this nice project of yours. Would you consider a OS pcb that fits the UMS mounting standard?
The 5U 400mm with standard drilling has space for 16 output mosfets, still plenty right?
reconsider that Aleph is circuit simply not able to even make a Klunk! , let alone pass it

so , you're doomed on pure A class , thus needing everything heatsink can cope with

so , 30V rails are pretty much in SciFi realm
__________________
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 12th February 2018, 02:30 PM   #57
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by Eric View Post
Nice work, Zen! Clever solution to offset. That's a lot of hardware to drop into the mail...



Quote:
Several iterations of amp were made , in various sizes and complexity , several threads …… to my knowledge most comprehensive being this one , also extremely worth mentioning is Eric’s web page , dedicated to his Aleph X incarnation.
(links aren't transferred in quote , but they are in text in my blog )
__________________
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 18th February 2018, 12:47 PM   #58
slowikpl is offline slowikpl  Poland
diyAudio Member
 
Join Date: Mar 2006
Location: Poland - Wroclaw
Hello All.

I`m the proud owner of those Amplifers. First of all I wanted Thank Zen-Mod for his courage to build me those Amplifers after my beloved first Aleph-X gave up after 8-9 yers of playing. The build quality is really great, and you have seen on the pictures. Many of yours are asking how do they sound. Well in very short: As I Like it , hooped for and way beyond that !!! ;-)
I`m sins one week not sleeping well because of those Amplifiers. You know why. Listening , Listening , admire aso.
After 2 days of continuous playing them, a friend came ( an audiophile freak ) and listened it with me. He`s a tube Lover ( Manley gear like : Manley Neo-Classic 300b and Monos Manley Snapper , Lodspeakers Davone Grande and MBL 1611F, 1621 )
This “Sisy” had tears in his eyes after 2 songs he wanted to hear. I must admit those ware very depressing songs ( don’t remember what those are ), but I think he was very delightful to hear / see this as it suppose to be reproduced.
On last Friday I had also some Audio - lovers at my home. Very different style music lovers. From Classic, Opera – singing style , Jazz and Popular music lovers. And must say That Everybody was satisfied about the reproduction.
It`s very hard to put in words what I`m hearing and write about that. English is not my Native language , so sorry for that!
In Compare to my Old Aleph-X ( like 60W on IRFP9610 ) every good aspects like : fullness of the sound , Emotions , easiness of reproduction remained as they are. Only more real. I mean that on the Old Aleph-X , sometimes the sound was like a drama. Calling for attention in some parts of the frequencies. This is not the case with those Amplifiers. They stay real , clean ,and no adds in the sound like it was with the old Aleph-X. Just Real , and yet FULL Loaded EMOTIONS presentation. Amazing performance and the bonus is what I missed totally was the Huge SPACE and sound localization in that space. That’s what is really amazing. I had this never before. For example PL 60.8 was the Space and pinpoint bass reproduction what I liked very much. In PL 160.5 was the softness on hights , midds very pleasant thing. And here I Have those things combined together plus many many more from them all. For example the Bass is far better then any of Amplifer i had and heard. Very well defined, and very tight. Midds are very real yet very full and reach. Hights are like a sparkle in the night sky. What was mentioned very often during last listening session was the Energy of sound coming from my system. Maybe that’s why everything sounded so damn real to us yet pleasant for long listening session ( we have been listening to 3.30 in the morning ;-) )

That’s all for now , hope you understood that I was trying to tell you all about those amplifiers. I wonder how will they sound after burn-in , and how long will it take to Burn them In ?

Thank you again ZEN for those wonderful peace of instrument!!

Last edited by slowikpl; 18th February 2018 at 12:56 PM.
  Reply With Quote
Old 18th February 2018, 12:55 PM   #59
Zen Mod is online now Zen Mod  Serbia
Official Court Jester
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
__________________
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 18th February 2018, 06:18 PM   #60
WBS is offline WBS  United States
diyAudio Member
 
Join Date: Jan 2007
Location: Napa Valley
Your English is very good! Good enough to almost bring tears to my eyes just reading your description.
__________________
"Why do we try to fool the ear? Because it makes people happy and it makes it easier to listen to stuff."
Nelson Pass, BAF 2012
  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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Aleph J Versus Babelfish J V2 Doppler9000 Pass Labs 8 1st August 2017 03:16 AM
to all greedy boyz Zen Mod Pass Labs 44 25th June 2007 12:15 AM
greedy boyz ............again Zen Mod Pass Labs 30 14th June 2007 04:03 PM


New To Site? Need Help?

All times are GMT. The time now is 08:39 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki