Beast with a Thousand JFETs - Page 3 - 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 28th August 2009, 02:28 AM   #21
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
Originally Posted by Diomedian View Post
Jeez - how many 2sk170s do you need to come up with a matched millennia?
here's a hint -- 2sk170's are graded in 3 bins -- GR, BL and V. It's my guess that the devices are normally distributed around ~6.6 mA Idss and the bottom part of the tail (below idss of nominally 5, but in actuality 6) is cut off. Hard for me to know if the top of the tail are outliers, but I suspect so.

Depending upon the "precision" you need, this should give you a pretty good estimate!

This would be an excellent "guess the number of jellie beans in the glass jar" question. There oughta be a prize!
  Reply With Quote
Old 28th August 2009, 03:11 AM   #22
moe29 is offline moe29  United States
diyAudio Member
 
moe29's Avatar
 
Join Date: Dec 2002
Location: Florida
Send a message via AIM to moe29 Send a message via Yahoo to moe29
I'd like to make that just 'cause it looks cool : )
  Reply With Quote
Old 28th August 2009, 03:17 AM   #23
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally Posted by Diomedian View Post
Jeez - how many 2sk170s do you need to come up with a matched millennia?
About 1000. I only need to match the average of all P and
N channels. I measure the Idss of all the devices in any case.
  Reply With Quote
Old 28th August 2009, 04:07 AM   #24
49 - for the 18th time
diyAudio Member
 
c2cthomas's Avatar
 
Join Date: Oct 2006
Location: Near "Music City" (Nashville Tennessee)
Quote:
Originally Posted by maxlorenz View Post
Heat? I heard someone immersed some amp on oil...maybe vaseline, with its many uses , could also work.
Regards,
M
Hmmm - cooking oil heated by 1000 (at least) FET's = deep fried [your choice of food]. This is something we know a lot about in da South!!
Attached Images
File Type: jpg Donut frier.jpg (9.9 KB, 2581 views)
  Reply With Quote
Old 28th August 2009, 11:58 AM   #25
diyAudio Member
 
Join Date: Apr 2007
Nelson,
With the number of jfets you consume you should be able to get Toshiba or someone else to make a new batch of complementary 109's or even a power jfet to your specs. Just the members alone on this forum would be quite a large order.
What are the actual dimensions of that pcb?

Tad
  Reply With Quote
Old 28th August 2009, 02:39 PM   #26
Vix is offline Vix  Yugoslavia
diyAudio Member
 
Vix's Avatar
 
Join Date: Nov 2003
Location: Somewhere on Planet Earth
If a picture is worth a thousand words, then an amplifier is worth a thousand J-fets...
Attached Images
File Type: gif cool.gif (1.1 KB, 2811 views)
  Reply With Quote
Old 28th August 2009, 02:54 PM   #27
wicked1 is offline wicked1  United States
diyAudio Member
 
wicked1's Avatar
 
Join Date: Jan 2008
Location: Midwest
Quote:
Originally Posted by Nelson Pass View Post
Variac and Elena and Jill and I all went to see Thievery Corporation at the Warfield a couple years back.

The performances were awesome but the sound system sucked.




Tosca / Suzuki
After getting into building my hi-fi system, concerts don't cut it anymore!
But yeah, I didn't realize they used all real instruments. I was very impressed when I saw them live! Most bands Ive seen w/ a very large stage show get sloppy, but thievery corp managed to stay right on the entire time.
  Reply With Quote
Old 28th August 2009, 03:28 PM   #28
Paper mache horn fabricator
diyAudio Member
 
carpenter's Avatar
 
Join Date: Mar 2002
Location: Oregon City, Oregon
Some jfets are very inexpensive in quantity purchases....... what a cool idea.
__________________
I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com
  Reply With Quote
Old 28th August 2009, 08:43 PM   #29
diyAudio Member
 
Join Date: Jan 2008
This will be very intersting to see when the board is populated.
Attached Images
File Type: jpg Beast.jpg (92.5 KB, 2388 views)
  Reply With Quote
Old 28th August 2009, 09:25 PM   #30
diyAudio Member
 
Join Date: Feb 2005
Location: S.England
If ever something needed surface mounting it is that design. Esp the stuffing stage.

Mental with a capital M

PCB = heatsink?
  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
The beast OTL daly41k Tubes / Valves 0 18th January 2009 04:09 PM
Thought experiment: A thousand 12V car batteries in series bigwill Everything Else 6 21st June 2007 04:56 AM
The Beast... sklimek Tubes / Valves 5 29th June 2005 05:04 PM
Making a beast of an amp sbattersby 115 Instruments and Amps 29 16th May 2005 04:28 PM
Hello from the land of thousand smiles, Thailand fahlap Introductions 2 26th December 2004 06:32 AM


New To Site? Need Help?

All times are GMT. The time now is 03:55 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