(x) (x) = N_p - 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 5th June 2003, 01:53 PM   #1
diyAudio Member
 
macka's Avatar
 
Join Date: Dec 2001
Location: Australia
Default (x) (x) = N_p

Hi everyone,

Well I am certainly not the first to surface a new X ALEPH on the forum but I feel all should be shared.

At last the parts arrived (transformers), so carefully everthying was checked and re checked, On goes the switch oowee no smoke.

Technically all has been said in other threads, this one has 13.4 Dcv on the rails using the original shematics with 2 pairs of IRF240's a side, the bias reads about 0.5 volts across the 0.22 ohms resisters, hot enough says I with a wink.

I have a few milli volts of offset and less then 200mill volts absolute offsett....I mean who cares...it seem to be erroding with warm up like Mr Pass says..

Okay. The lounge rooms looks like a mad scientist's picnic but wow!!Having dragged a bunch of wires, castings and big R/S into the listening domain it looks like CPO3 mixed up.

Using the recently modified X BOSOZ, the sound would appear be from the works of Mr Pass in the AX Pdf. There is no point beating around the bush, its that good.

The baby X Aleph had no problems at all man handling the Greg Timbers (JBL legend) 4345 JBL design with easy. The bass was a real surprise, it rendered space and timbre with accute accuracy and power. The vocals appear to be more visable to the eye and ear and all is revealed in the mix. The Micro dynamic resolve and instrumental clarity is spine tingling via the super 10 inch 2122 mid cone.

I find this quite exciting, at last an amp (a system) that allows you to view the portrait as is....... face on the canvas.

And I can see the peanut butter & chocolate from here.

Where do I go from here...my oh my.

Thankyou everyone for this forum and especially Mr Pass.

regards

Ian
  Reply With Quote
Old 5th June 2003, 01:59 PM   #2
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Come on macka, don't tease, where are the pics?
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 5th June 2003, 02:16 PM   #3
Taco is offline Taco  Netherlands
diyAudio Member
 
Join Date: Nov 2002
Location: Place in the Netherlands
Did you change r12 and r34 to set the current gain to ~50% ? Because you are using irfp240.

And the big question is, what are you doing with your other Pass .

/Taco still waiting for his trannies.
  Reply With Quote
Old 5th June 2003, 02:25 PM   #4
diyAudio Member
 
macka's Avatar
 
Join Date: Dec 2001
Location: Australia
Hey you lot,

Give me a go........I'm still listening..James Morrison at the moment.....stuff the current share for the moment..........I don't care right now.....zonk. Just eat my ears bab.

Let me show you soon....the new woman in my life.....she will just blow you away...really!!! Trust me....Muhhahahahaha

We're just getting to know each other on first name basis.

So cool it ....you lot.

Ian
  Reply With Quote
Old 5th June 2003, 02:42 PM   #5
diyAudio Member
 
Join Date: Apr 2002
Location: Netherlands
Congratulations!

Great looking amp!

Edwin

P.S. How is your absolute DC offset going? Does it stabilize after some while (hours)?
  Reply With Quote
Old 5th June 2003, 02:56 PM   #6
diyAudio Member
 
macka's Avatar
 
Join Date: Dec 2001
Location: Australia
Hi Edwin,

Correct,

The absolute offset would appear to be declining, about 200mv in full fight. I'll look at the current share tomorrow.

Mind you I have not seriously tweeked anything. Just balanced her and a quick null on the central diff pair..... I'm more concerned about 30 watts per device, but I trust IRF @ 60 C.

Andrea...The Corrs on at the moment...getting physical.

The X Aleph appears to have uncanny spead of sound stage and limitless depth. Ouch she just pinched my bum.

Ian
  Reply With Quote
Old 5th June 2003, 03:08 PM   #7
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Default I knew it....

With the gear you're running, I just knew this amp was going to blow your mind!

Happy trails.........

John Inlow
  Reply With Quote
Old 5th June 2003, 03:19 PM   #8
diyAudio Member
 
macka's Avatar
 
Join Date: Dec 2001
Location: Australia
Some subjective view before the neighbours crack it,

The A Aleph appears to hightlight tranisents very well,

Any percussive sounds...Caroline's drum kit...its so real you can fell the snap of the snare, the crack of the kick.... its in the room surrrrrrrrrrrreal.

And Where are those 18 inch woofers.........they disppeared...the distinction between felt and heard bass is like a tremor and shock wave.

The the harder I push the better she performs without effort.

Ian '

Heres a snippet of the board in progress...this is all John Inlow's handy work.
Attached Images
File Type: jpg board.jpg (54.2 KB, 1605 views)
  Reply With Quote
Old 5th June 2003, 03:30 PM   #9
diyAudio Member
 
macka's Avatar
 
Join Date: Dec 2001
Location: Australia
Well,

Thanks for your response and sharing.

Enjoy...........and thanks Greg Timbers for the delivery...

Greg Timbers was kind enough to provide detailed technical information and guidance on the tuning of my JBL 4345 heritage project. This is a stunning speaker system.... a masterpiece acoustic engineering.

Ian

Greg Timbers - Chief Development Engineer for Harman Consumer
Attached Images
File Type: jpg timbers1_small.jpg (38.8 KB, 1556 views)
  Reply With Quote
Old 5th June 2003, 03:50 PM   #10
diyAudio Member
 
macka's Avatar
 
Join Date: Dec 2001
Location: Australia
The JBL 4345 for those unfamilair...
Attached Images
File Type: jpg jbl4345.jpg (11.9 KB, 1491 views)
  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 10:35 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